From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Fri, 23 Oct 2009 09:34:57 +1000

Date: Fri, 23 Oct 2009 09:34:57 +1000

Dear subscribers,

This week's email was collated by Chao Feng. There are 38 new abstracts and 11

replacements.

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arXiv:0907.2445

Date: Wed, 15 Jul 2009 17:49:04 GMT (18kb)

Title: Time Irreversibility Problem and Functional Formulation of Classical

Mechanics

Authors: Igor V. Volovich

Categories: cond-mat.stat-mech math-ph math.MP physics.class-ph

Comments: 21 pages

\\

The time irreversibility problem is the dichotomy of the reversible

microscopic dynamics and the irreversible macroscopic physics. This problem was

considered by Boltzmann, Poincar\'e, Bogolyubov and many other authors and

though some researchers claim that the problem is solved, it deserves a further

study. In this paper an attempt is performed of the following solution of the

irreversibility problem: a formulation of microscopic dynamics is suggested

which is irreversible in time.

A widely used notion of microscopic state of the system at a given moment of

time as a point in the phase space and also a notion of trajectory does not

have an immediate physical meaning since arbitrary real numbers are non

observable. In the approach presented in this paper the physical meaning is

attributed not to an individual trajectory but only to a bunch of trajectories

or to the distribution function on the phase space.

The fundamental equation of the microscopic dynamics in the proposed

"functional" approach is not the Newton equation but the Liouville equation for

the distribution function of a single particle. Solutions of the Liouville

equation have the property of delocalization which accounts for

irreversibility. It is shown that the Newton equation in this approach appears

as an approximate equation describing the dynamics of the average values of the

position and momenta. Corrections to the Newton equation are computed.

\\ ( http://arxiv.org/abs/0907.2445 , 18kb)

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arXiv:0909.0491

Date: Wed, 2 Sep 2009 19:18:46 GMT (2783kb)

Title: Light scattering for thermometry of fermionic atoms in an optical

lattice

Authors: J. Ruostekoski, C. J. Foot, and A. B. Deb

Categories: cond-mat.quant-gas quant-ph

Comments: submitted to PRL in January 2009

\\

We propose a method for measuring the temperature of fermionic atoms in an

optical lattice potential from the intensity of the scattered light in the

far-field diffraction pattern. We consider a single-component gas in a

tightly-confined two-dimensional lattice, illuminated by far off-resonant light

driving a cycling transition. Our calculations show that thermal correlations

of the fermionic atoms generate fluctuations in the intensity of the

diffraction pattern of light scattered from the atomic lattice array and that

this signal can be accurately detected above the shot noise using a lens to

collect photons scattered in a forward direction (with the diffraction maxima

blocked). The sensitivity of the thermometer is enhanced by an additional

harmonic trapping potential.

\\ ( http://arxiv.org/abs/0909.0491 , 2783kb)

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arXiv:0909.0705

Date: Thu, 3 Sep 2009 16:27:14 GMT (18kb)

Title: Rabi Interferometry and Sensitive Measurement of the Casimir-Polder

Force with Ultra-Cold Gases

Authors: Jan Chwede\'nczuk, Luca Pezz\'e, Francesco Piazza and Augusto Smerzi

Categories: quant-ph cond-mat.other

\\

We show that Rabi oscillations of a degenerate fermionic or bosonic gas

trapped in a double-well potential can be exploited for the interferometric

measurement of external forces at micrometer length scales. The Rabi

interferometer is less sensitive, but easier to implement, than the

Mach-Zehnder since it does not require dynamical beam-splitting/recombination

processes. As an application we propose a measurement of the Casimir-Polder

force acting between the atoms and a dielectric surface. We find that even if

the interferometer is fed with a coherent state of relatively small number of

atoms, and in the presence of realistic experimental noise, the force can be

measured with a sensitivity sufficient to discriminate between thermal and

zero-temperature regimes of the Casimir-Polder potential. Higher sensitivities

can be reached with spin squeezed states.

\\ ( http://arxiv.org/abs/0909.0705 , 18kb)

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arXiv:0909.0728

Date: Thu, 3 Sep 2009 19:56:49 GMT (213kb,D)

Title: Simulating and detecting artificial magnetic fields in trapped atoms

Authors: Matthias Rosenkranz, Alexander Klein, Dieter Jaksch

Categories: cond-mat.quant-gas cond-mat.other quant-ph

Comments: 14 pages, 9 figures

\\

A Bose-Einstein condensate exhibiting a nontrivial phase induces an

artificial magnetic field in immersed impurity atoms trapped in a stationary,

ring-shaped optical lattice. We present an effective Hamiltonian for the

impurities for two condensate setups: the condensate in a rotating ring and in

an excited rotational state in a stationary ring. We use Bogoliubov theory to

derive analytical formulas for the induced artificial magnetic field and the

hopping amplitude in the limit of low condensate temperature where the impurity

dynamics is coherent. As methods for observing the artificial magnetic field we

discuss time of flight imaging and mass current measurements. Moreover, we

compare the analytical results of the effective model to numerical results of a

corresponding two-species Bose-Hubbard model. We also study numerically the

clustering properties of the impurities and the quantum chaotic behavior of the

two-species Bose-Hubbard model.

\\ ( http://arxiv.org/abs/0909.0728 , 213kb)

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arXiv:0909.0761

Date: Thu, 3 Sep 2009 20:58:01 GMT (109kb)

Title: Soliton creation during a Bose-Einstein condensation

Authors: Bogdan Damski and Wojciech H. Zurek

Categories: cond-mat.quant-gas

Comments: 4+ pages, 3 figures

Report-no: LA-UR 09-05090

\\

We study the process of soliton creation during a non-equilibrium second

order phase transition. We investigate a simple model (stochastic

Gross-Pitaevskii equation) that simulates many aspects of the normal gas --

Bose-Einstein condensate transition. We show that the quench leads to creation

of solitons, whose density follows a Kibble-Zurek-like scaling law involving

critical exponents.

\\ ( http://arxiv.org/abs/0909.0761 , 109kb)

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arXiv:0909.0976

Date: Fri, 4 Sep 2009 22:52:25 GMT (1578kb,D)

Title: Magnetic structure of an imbalanced Fermi gas in an optical lattice

Authors: B. Wunsch, L. Fritz, N.T. Zinner, E. Manousakis, E. Demler

Categories: cond-mat.quant-gas cond-mat.str-el

Comments: 11 pages, 10 figures

\\

We analyze the repulsive fermionic Hubbard model on square and cubic lattices

with spin imbalance and in the presence of a parabolic confinement. We analyze

the magnetic structure as a function of the repulsive interaction strength and

polarization. In the first part of the paper we perform unrestricted

Hartree-Fock calculations for the 2D case and find that above a critical

interaction strength $U_c$ the system turns ferromagnetic at the edge of the

trap, in agreement with the ferromagnetic Stoner instability of a homogeneous

system away from half-filling. For $U<U_c$ we find a canted antiferromagnetic

structure in the Mott region in the center and a partially polarized

compressible edge. The antiferromagnetic order in the Mott plateau is

perpendicular to the direction of the imbalance. In this regime the same

qualitative behavior is expected for 2D and 3D systems. In the second part of

the paper we give a general discussion of magnetic structures above $U_c$. We

argue that spin conservation leads to nontrivial textures, both in the

ferromagnetic polarization at the edge and for the Neel order in the Mott

plateau. We discuss differences in magnetic structures for 2D and 3D cases.

\\ ( http://arxiv.org/abs/0909.0976 , 1578kb)

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arXiv:0909.0837

Date: Fri, 4 Sep 2009 08:54:17 GMT (427kb)

Title: Evidence of antiblockade in an ultracold Rydberg gas

Authors: Thomas Amthor, Christian Giese, Christoph S. Hofmann, Matthias

Weidem\"uller

Categories: physics.atom-ph

\\

We present the experimental observation of the antiblockade in an ultracold

Rydberg gas recently proposed by Ates et al. [Phys. Rev. Lett. 98, 023002

(2007)]. Our approach allows the control of the pair distribution in the gas

and is based on a strong coupling of one transition in an atomic three-level

system, while introducing specific detunings of the other transition. When the

coupling energy matches the interaction energy of the Rydberg long-range

interactions, the otherwise blocked excitation of close pairs becomes possible.

A time-resolved spectroscopic measurement of the Penning ionization signal is

used to identify slight variations in the Rydberg pair distribution of a random

arrangement of atoms. A model based on a pair interaction Hamiltonian is

presented which well reproduces our experimental observations and allows one to

analyze the distribution of nearest neighbor distances.

\\ ( http://arxiv.org/abs/0909.0837 , 427kb)

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arXiv:0909.0920

Date: Fri, 4 Sep 2009 19:01:04 GMT (47kb)

Title: Stability of Bose-Einstein condensates in a circular array

Authors: E. T. D. Matsushita and E. J. V. de Passos

Categories: cond-mat.quant-gas

Comments: 11 pages,2 figures, 5 tables

\\

The properties of the superfluid phase of ultra cold bosonic atoms loaded in

a circular array are investigated in the framework of the Bose-Hubbard model

and the Bogoliubov theory. We derive and solve the Gross-Pitaevskii equation of

the model to find that the atoms condense in states of well-defined

quasimomentum. A detailed analysis of the coupling structure in the effective

quadratic grand-canonical Hamiltonian shows that only pairs of distinct and

identical quasimomenta are coupled. Solving the corresponding Bogoliubov-de

Gennes equations we see that each pair of distinct quasimomenta gives raise to

doublets in the excitation energy spectrum and that the quasimomenta of the

zero-energy mode and of the occupied state in the condensates are identical.

The dynamical and energetic stabilities of the condensates are determined by

studying the behavior of the elementary excitations in the control parameters

space. Our investigation establishes that superflow condensates exists only in

the central region of the first Brillouin zone whereas there is none in the

last quarters since they are energetically unstable, independently of the

control parameters.

\\ ( http://arxiv.org/abs/0909.0920 , 47kb)

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arXiv:0909.0886

Date: Fri, 4 Sep 2009 13:19:35 GMT (205kb,D)

Title: Second sound dipole mode in a partially Bose-Einstein condensed gas

Authors: R. Meppelink, S. B. Koller, J. M. Vogels, H. T. C. Stoof, and P. van

der Straten

Categories: cond-mat.quant-gas

Comments: Submitted to Phys. Rev. Lett. with 5 figures

\\

We study the second sound dipole mode in a partially Bose-Einstein condensed

gas. This mode is excited by spatially separating and releasing the

center-of-mass of the Bose-Einstein condensate (BEC) with respect to the

thermal cloud, after which the equilibration is observed. The oscillation

frequency and the damping rate of this mode is studied for different harmonic

confinements and temperatures. The measured damping rates close to the

collisionless regime are found to be in good agreement with Landau damping. For

increasing hydrodynamicity of the cloud we observe an increase of the damping.

\\ ( http://arxiv.org/abs/0909.0886 , 205kb)

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arXiv:0909.0834

Date: Fri, 4 Sep 2009 08:18:53 GMT (187kb)

Title: Weak coupling regime of the Landau-Zener transition for association of

an atomic Bose-Einstein condensate

Authors: N. Sahakyan, H. Azizbekyan, H. Ishkhanyan, R. Sokhoyan, and A.

Ishkhanyan

Categories: cond-mat.quant-gas

Comments: accepted for publication in Laser Physics (13 pages, 3 figures)

\\

In the framework of a basic semiclassical time-dependent nonlinear two-state

problem, we study the weak coupling limit of the nonlinear Landau-Zener

transition at coherent photo- and magneto-association of an atomic

Bose-Einstein condensate. Using an exact third-order nonlinear differential

equation for the molecular state probability, we develop a variational approach

which enables us to construct an accurate analytic approximation describing

time dynamics of the coupled atom-molecular system for the case of weak

coupling. The approximation is written in terms of the solution to an auxiliary

linear Landau-Zener problem with some effective Landau-Zener parameter. The

dependence of this effective parameter on the input Landau-Zener parameter is

found to be unexpected: as the generic Landau-Zener parameter increases, the

effective Landau-Zener parameter first monotonically increases (starting from

zero), reaches its maximal value and then monotonically decreases again

reaching zero at some point. The constructed approximation quantitatively well

describes many characteristics of the time dynamics of the system, in

particular, it provides a highly accurate formula for the final transition

probability to the molecular state. The present result for the final transition

probability improves the accuracy of the previous approximation by Ishkhanyan

et al. [Phys. Rev. A 69, 043612 (2004); J. Phys. A 38, 3505 (2005)] by order of

magnitude.

\\ ( http://arxiv.org/abs/0909.0834 , 187kb)

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arXiv:0909.0845

Date: Fri, 4 Sep 2009 09:47:46 GMT (113kb)

Title: Dynamics for partially coherent Bose-Einstein condensates in double

wells

Authors: Li-Hua Lu and You-Quan Li

Categories: cond-mat.quant-gas

Comments: Revtex, 6 pages, 5 figures, to appear in PRA

\\

The dynamical properties of partially coherent Bose-Einstein condensates in

double wells are investigated in three typical regimes. In the extreme Fock

regime, the time evolution of the degree of coherence is shown to decay

rapidly. In the Rabi regime, a relation between the amplitude of Rabi

oscillation and the degree of coherence is obtained, which is expected to

determine the degree of coherence by measuring the amplitude of Rabi

oscillation. The study on the self-trapping phenomena in the Josephson regime

exhibits that both the degree of coherence and the initial relative phase can

affect the final particle distribution.

\\ ( http://arxiv.org/abs/0909.0845 , 113kb)

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arXiv:0909.1192

Date: Mon, 7 Sep 2009 09:52:03 GMT (67kb,D)

Title: Interaction regimes in quasi-one-dimensional dipolar Bose gases

Authors: Frank Deuretzbacher, Jonas Christensson, Stephanie M. Reimann

Categories: cond-mat.quant-gas cond-mat.other

\\

We study a quasi-one-dimensional system of bosons with dipole-dipole

repulsion by means of the exact diagonalization method. Up to three interaction

regimes are found depending on the strength of the interaction potential and

the anisotropy of the trap: A regime, where the dipolar Bose gas resembles a

system of weakly delta-interacting bosons, a second regime, where the bosons

are fermionized, and a third regime, where the bosons form a Wigner crystal. In

the first two regimes the dipole-dipole potential can be replaced by a

delta-potential. In the crystalline state the overlap between the localized

wave packets is strongly reduced and all the properties of the boson system

equal those of its fermionic counterpart.

\\ ( http://arxiv.org/abs/0909.1192 , 67kb)

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arXiv:0909.1158

Date: Mon, 7 Sep 2009 07:53:43 GMT (9kb)

Title: Dynamics of wave packets for the nonlinear Schroedinger equation with a

random potential

Authors: A. Iomin

Categories: cond-mat.stat-mech cond-mat.dis-nn

Journal-ref: PHYSICAL REVIEW E 80, 037601 (2009)

\\

The dynamics of an initially localized Anderson mode is studied in the

framework of the nonlinear Schroedinger equation in the presence of disorder.

It is shown that the dynamics can be described in the framework of the

Liouville operator. An analytical expression for a wave function of the initial

time dynamics is found by a perturbation approach. As follows from a

perturbative solution the initially localized wave function remains localized.

At asymptotically large times the dynamics can be described qualitatively in

the framework of a phenomenological probabilistic approach by means of a

probability distribution function. It is shown that the probability

distribution function may be governed by the fractional Fokker-Planck equation

and corresponds to subdiffusion.

\\ ( http://arxiv.org/abs/0909.1158 , 9kb)

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arXiv:0909.1186

Date: Mon, 7 Sep 2009 09:32:00 GMT (40kb)

Title: Scheme of thinking quantum systems

Authors: V.I. Yukalov and D. Sornette

Categories: quant-ph

Comments: Latex file, 15 pages, 1 figure

Journal-ref: Laser Phys. Lett. 6 (2009) 833-839

\\

A general approach describing quantum decision procedures is developed. The

approach can be applied to quantum information processing, quantum computing,

creation of artificial quantum intelligence, as well as to analyzing decision

processes of human decision makers. Our basic point is to consider an active

quantum system possessing its own strategic state. Processing information by

such a system is analogous to the cognitive processes associated to decision

making by humans. The algebra of probability operators, associated with the

possible options available to the decision maker, plays the role of the algebra

of observables in quantum theory of measurements. A scheme is advanced for a

practical realization of decision procedures by thinking quantum systems. Such

thinking quantum systems can be realized by using spin lattices, systems of

magnetic molecules, cold atoms trapped in optical lattices, ensembles of

quantum dots, or multilevel atomic systems interacting with electromagnetic

field.

\\ ( http://arxiv.org/abs/0909.1186 , 40kb)

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arXiv:0909.1298

Date: Mon, 7 Sep 2009 18:32:50 GMT (112kb)

Title: Finite-density corrections to the Unitary Fermi gas: A lattice

perspective from Dynamical Mean-Field Theory

Authors: A. Privitera, M. Capone, C. Castellani

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 9 pages, 8 figures

\\

We investigate the approach to the universal regime of the dilute unitary

Fermi gas as the density is reduced to zero in a lattice model. To this end we

study the chemical potential, superfluid order parameter and internal energy of

the attractive Hubbard model in three different lattices with densities of

states (DOS) which share the same low-energy behavior of fermions in

three-dimensional free space: a cubic lattice, a "Bethe lattice" with a

semicircular DOS, and a "lattice gas" with parabolic dispersion and a sharp

energy cut-off that ensures the normalization of the DOS. The model is solved

using Dynamical Mean-Field Theory, that treats directly the thermodynamic limit

and arbitrarily low densities, eliminating finite-size effects. At densities of

the order of one fermion per site the lattice and its specific form dominate

the results. The evolution to the low-density limit is smooth and it does not

allow to define an unambiguous low-density regime. Such finite-density effects

are significantly reduced using the lattice gas, and they are maximal for the

three-dimensional cubic lattice. Even though dynamical mean-field theory is

bound to reduce to the more standard static mean field in the limit of zero

density due to the local nature of the self-energy and of the vertex functions,

it compares well with accurate Monte Carlo simulations down to the lowest

densities accessible to the latter.

\\ ( http://arxiv.org/abs/0909.1298 , 112kb)

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arXiv:0909.1133

Date: Mon, 7 Sep 2009 15:53:09 GMT (502kb)

Title: Near-resonance Light Scattering from a High-density, Ultracold Atomic

$^{87}$Rb Gas

Authors: S. Balik, A.L. Win and M.D. Havey

Categories: quant-ph

Comments: 10 pages, 11 figures

\\

We report experimental investigation of hyperfine optical pumping and near

resonance light scattering from a high-density and ultracold atomic $^{87}$Rb

gas. The atomic sample, having a peak density $\sim 5\cdot10^{13}$

atoms/cm$^{3}$, temperature $\sim$ 65 $\mu$K and initially prepared in the F =

1 lower energy $^{87}$Rb hyperfine component, is optically pumped to the higher

energy F = 2 hyperfine level. Measurements are made of the transient hyperfine

pumping process and of the time evolution of scattering of near resonance probe

radiation on the $F = 2 \to F' = 3$ transition. Features of the density,

detuning, and probe laser intensity dependence of the signals are attributed to

the high peak density and consequent large optical depth of the samples.

\\ ( http://arxiv.org/abs/0909.1133 , 502kb)

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arXiv:0909.1336

Date: Mon, 7 Sep 2009 20:37:20 GMT (31kb)

Title: Expectation Values in the Lieb-Liniger Bose Gas

Authors: M. Kormos, G. Mussardo, A. Trombettoni

Categories: cond-mat.stat-mech cond-mat.quant-gas

\\

The expectation values of field operators are basic quantities of any

interacting quantum theory, both for theoretical and experimental reasons. We

present a novel method to compute, at zero and finite temperature, expectation

values in the Lieb-Liniger model. These quantities, relevant in the physics of

one-dimensional ultracold Bose gases, are expressed by a series that has a

remarkable behaviour of convergence. Among other results, we show the

computation of the three-body expectation value at finite temperature, a

quantity that rules the recombination rate of the Bose gas.

\\ ( http://arxiv.org/abs/0909.1336 , 31kb)

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arXiv:0909.1068

Date: Mon, 7 Sep 2009 17:23:24 GMT (1074kb)

Title: Exact Solution of Bogoliubov Equations for Bosons in One-Dimensional

Piecewise Constant Potential

Authors: Daisuke Takahashi

Categories: cond-mat.quant-gas

Comments: 12 pages, 15 figures

\\

We show that Bogoliubov equations in one-dimensional systems with piecewise

constant potentials can be always solved. In particular, we analyze in detail

the case where the condensate wavefunction is a real-valued function, and give

the explicit expressions for wavefunctions of Bogoliubov excitations. By means

of these solutions, we consider transmission and reflection properties of

Bogoliubov excitations for two types of potential, namely, a rectangular

barrier and a potential step. The results yield simple and exact examples of

anomalous tunneling effect and quantum evaporation.

\\ ( http://arxiv.org/abs/0909.1068 , 1074kb)

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arXiv:0909.1314

Date: Mon, 7 Sep 2009 19:17:37 GMT (6kb)

Title: Effective Potential from the Effective-Range Expansion at Zero-Crossing

in a Two-Channel Feshbach Model

Authors: N. T. Zinner

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 3 pages, no figures

\\

We consider a two-channel Feshbach model and determine the effective-range

expansion. While this expansion is badly behaved when the scattering length

goes to zero, we demonstate that effective potentials based on the lowest order

terms agree with those obtained from the full T-matrix. This result holds for

the low momenta of atoms in a Bose-Einstein condensate experiment. We find that

the temperature regime where the effective potential obtained is valid is

safely inside that of typical experiments.

\\ ( http://arxiv.org/abs/0909.1314 , 6kb)

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arXiv:0909.1140

Date: Mon, 7 Sep 2009 04:11:05 GMT (27kb)

Title: Critical Velocities for Roton and Super-Flow Quantum Turbulence in

Liquid $^4$He

Authors: V. I. Kruglov

Categories: cond-mat.other cond-mat.supr-con

Comments: It is submitted to Physical Review Letters

\\

Two different types of transitions of the superfluid $^4$He to quantum

turbulence regimes are studied for $1{\rm D}$ geometry in the case when the

influence of the normal fluid on superfluid flow is suppressed. It is shown

that the roton mechanism of transition to quantum turbulence leads to a

critical velocity satisfying the relation $v_c\propto d^{-1/4}$. In the

super-flow mechanism, the transition to quantum turbulence arises when the

"quantum Reynolds number" is about $10^3$ and the critical velocity depends on

channel size $d$ as $v_c\propto d^{-1}$ in agreement with the equations of

motion for a superfluid component of the liquid $^4$He being disturbed by small

fluctuations of the normal fluid.

\\ ( http://arxiv.org/abs/0909.1140 , 27kb)

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arXiv:0909.1228 (*cross-listing*)

Date: Mon, 7 Sep 2009 11:58:07 GMT (176kb)

Title: Kadath: a spectral solver for theoretical physics

Authors: Philippe Grandclement (LUTH)

Categories: gr-qc hep-th physics.comp-ph

Comments: Submitted to Journal of Computational Physics

\\

Kadath is a library that implements spectral methods in a very modular

manner. It is designed to solve a wide class of problems that arise in the

context of theoretical physics. Several types of coordinates are implemented

and additional geometries can be easily encoded. Partial differential equations

of various types are discretized by means of spectral methods. The resulting

system is solved using a Newton-Raphson iteration. Doing so, Kadath is able to

deal with strongly non-linear situations. The algorithms are validated by

applying the library to four different problems of contemporary physics, in the

fields of gauge field theory and general relativity

\\ ( http://arxiv.org/abs/0909.1228 , 176kb)

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arXiv:0909.1553

Date: Tue, 8 Sep 2009 20:47:33 GMT (35kb)

Title: Interaction Quenches of Fermi Gases

Authors: G\"otz S. Uhrig

Categories: cond-mat.str-el cond-mat.quant-gas

Comments: 4 pages, 2 figures

\\

It is shown that the jump in the momentum distribution of Fermi gases evolves

smoothly for small and intermediate times once an interaction between the

fermions is suddenly switched on. The jump does not vanish abruptly. The loci

in momentum space where the jumps occur are those of the noninteracting Fermi

sea. No relaxation of the Fermi surface geometry takes place.

\\ ( http://arxiv.org/abs/0909.1553 , 35kb)

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arXiv:0909.1502

Date: Tue, 8 Sep 2009 14:42:22 GMT (57kb)

Title: Anomalous Exciton-Condensation in Graphene Bilayers

Authors: Yafis Barlas, Rene C\^ot\'e, J. Lambert and A. H. MacDonald

Categories: cond-mat.mes-hall

Comments: 4 pages, 1 figure

\\

In ordinary semiconductor bilayers, exciton condensates appear at total

Landau level filling factor $\nu_{T}=1$. We predict that similar states will

occur in Bernal stacked graphene bilayers at many non-zero integer filling

factors. For $\nu_{T} = -3,1$ we find that the superfluid density of the

exciton condensate vanishes and that a finite-temperature fluctuation induced

first order isotropic-smectic phase transition occurs when the layer densities

are not balanced. These anomalous properties of bilayer graphene exciton

condensates are due to the degeneracy of Landau levels with $n=0$ and $n=1$

orbital character.

\\ ( http://arxiv.org/abs/0909.1502 , 57kb)

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arXiv:0909.1387

Date: Tue, 8 Sep 2009 05:02:54 GMT (16kb)

Title: Wigner distributions for finite state systems without redundant phase

point operators

Authors: S. Chaturvedi, N. Mukunda and R.Simon

Categories: quant-ph

Comments: Latex, 14 pages

\\

We set up Wigner distributions for $N$ state quantum systems following a

Dirac inspired approach. In contrast to much of the work on this case,

requiring a $2N\times 2N$ phase space, particularly when $N$ is even, our

approach is uniformly based on an $N\times N $ phase space grid and thereby

avoids the necessity of having to invoke a `quadrupled' phase space and hence

the attendant redundance. Both $N$ odd and even cases are analysed in detail

and it is found that there are striking differences between the two. While the

$N$ odd case permits full implementation of the marginals property, the even

case does so only in a restricted sense. This has the consequence that in the

even case one is led to several equally good definitions of the Wigner

distributions as opposed to the odd case where the choice turns out to be

unique.

\\ ( http://arxiv.org/abs/0909.1387 , 16kb)

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arXiv:0909.1465

Date: Tue, 8 Sep 2009 11:43:29 GMT (184kb)

Title: Low velocity limits of cold atom clocks

Authors: J. Mu\~noz, I. Lizuain, J. G. Muga

Categories: quant-ph

Comments: 7 pages, 5 figures

Journal-ref: Phys. Rev. A 80, 022116 (2009)

\\

Fundamental low-energy limits to the accuracy of quantum clock and stopwatch

models in which the clock hand motion is activated by the presence of a

particle in a region of space have been studied in the past, but their

relevance for actual atomic clocks had not been assessed. In this work we

address the effect of slow atomic quantum motion on Rabi and Ramsey resonance

fringe patterns, as a perturbation of the results based on classical atomic

motion. We find the dependence of the fractional error of the corresponding

atomic clocks on the atomic velocity and interaction parameters.

\\ ( http://arxiv.org/abs/0909.1465 , 184kb)

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arXiv:0909.1561

Date: Tue, 8 Sep 2009 20:05:44 GMT (24kb)

Title: Trap and population imbalanced two-component Fermi gas in the BEC limit

Authors: S. A. Silotri

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 5 pages, 5 figures

\\

We study equal mass population imbalanced two-component atomic Fermi gas with

unequal trap frequencies $(\omega_{\uparrow} \neq \omega_{\downarrow})$ at zero

temperature using the local density approximation (LDA). We consider the

strongly attracting Bose-Einstein condensation (BEC) limit where polarized

(gapless) superfluid is stable. The system exhibits shell structure:

unpolarized SF$\to$polarized SF$\to$normal N. Compared to trap symmetric case,

when the majority component is tightly confined the gapless superfluid shell

grows in size leading to reduced threshold polarization to form polarized

(gapless) superfluid core. In contrast, when the minority component is tightly

confined, we find that the superfluid phase is dominated by unpolarized

superfluid phase with gapless phase forming a narrow shell. The shell radii for

various phases as a function of polarization at different values of trap

asymmetry are presented and the features are explained using the phase diagram.

\\ ( http://arxiv.org/abs/0909.1561 , 24kb)

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arXiv:0909.1496

Date: Tue, 8 Sep 2009 14:12:31 GMT (859kb)

Title: Direct observation of a magnetic Bose glass

Authors: Tao Hong, A. Zheludev, H. Manaka, and L.-P. Regnault

Categories: cond-mat.str-el

Comments: 4 pages, 3 figures

\\

We report the single crystal study of the bulk magnetization and neutron

scattering measurements on a quantum S=1/2 spin ladders system

IPA-Cu(Cl0.95Br0.05)3with quenched disorder. In zero field, the disordered spin

liquid phase is preserved as in pure IPA-CuCl3. Due to the bond randomness, a

novel Bose glass phase was directly observed in Hc<H<H', which separates the

spin liquid phase from the unconventional Bose-Einstein condensation phase. The

observed finite value of boson compressibility dM/dH and lack of field-induced

three-dimensional long range order are consistent with the theoretical

prediction.

\\ ( http://arxiv.org/abs/0909.1496 , 859kb)

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arXiv:0909.1469 (*cross-listing*)

Date: Tue, 8 Sep 2009 12:00:08 GMT (399kb)

Title: Towards Quantum Superposition of Living Organisms

Authors: Oriol Romero-Isart, Mathieu L. Juan, Romain Quidant, J. Ignacio Cirac

Categories: quant-ph cond-mat.mes-hall

Comments: 8 pages, 4 figures

\\

The most striking feature of quantum mechanics is the existence of

superposition states, where an object appears to be in different situations at

the same time. Up to now, the existence of such states has been tested with

small objects, like atoms, ions, electrons and photons, and even with

molecules. Recently, it has been even possible to create superpositions of

collections of photons, atoms, or Cooper pairs. Current progress in

optomechanical systems may soon allow us to create superpositions of even

larger objects, like micro-sized mirrors or cantilevers, and thus to test

quantum mechanical phenomena at larger scales. Here we propose a method to cool

down and create quantum superpositions of the motion of sub-wavelength,

arbitrarily shaped dielectric objects trapped inside a high--finesse cavity at

a very low pressure. Our method is ideally suited for the smallest living

organisms, such as viruses, which survive under low vacuum pressures, and

optically behave as dielectric objects. This opens up the possibility of

testing the quantum nature of living organisms by creating quantum

superposition states in very much the same spirit as the original

Schr\"odinger's cat "gedanken" paradigm. We anticipate our essay to be a

starting point to experimentally address fundamental questions, such as the

role of life in quantum mechanics, and differences between many-world and

Copenhagen interpretations.

\\ ( http://arxiv.org/abs/0909.1469 , 399kb)

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\\

arXiv:0909.1751

Date: Wed, 9 Sep 2009 19:38:48 GMT (81kb)

Title: Magnetic phase diagram of a spin-1 condensate in two dimensions with

dipole interaction

Authors: Jonas A. Kj\"all, Andrew M. Essin and Joel E. Moore

Categories: cond-mat.quant-gas

Comments: 10 pages, 7 figures

\\

Several new features arise in the ground-state phase diagram of a spin-1

condensate trapped in an optical trap when the magnetic dipole interaction

between the atoms is taken into account along with confinement and spin

precession. The boundaries between the regions of ferromagnetic and polar

phases move as the dipole strength is varied and the ferromagnetic phases can

be modulated. The magnetization of the ferromagnetic phase perpendicular to the

field becomes modulated as a helix winding around the magnetic field direction,

with a wavelength inversely proportional to the dipole strength. This

modulation should be observable for current experimental parameters in

$^{87}$Rb. Hence the much-sought supersolid state, with broken continuous

translation invariance in one direction and broken global U(1) invariance,

occurs generically as a metastable state in this system as a result of dipole

interaction. The ferromagnetic state parallel to the applied magnetic field

becomes striped in a finite system at strong dipolar coupling.

\\ ( http://arxiv.org/abs/0909.1751 , 81kb)

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\\

arXiv:0909.1683

Date: Wed, 9 Sep 2009 11:35:41 GMT (279kb,D)

Title: Nonequilibrium dynamics of vortex arrest in a finite temperature

Bose-Einstein condensate

Authors: T. M. Wright, A. S. Bradley, R. J. Ballagh

Categories: cond-mat.quant-gas

Comments: 9 pages, 6 figures

\\

We perform finite temperature dynamical simulations of the arrest of a

rotating Bose-Einstein condensate by a fixed trap anisotropy, using a

Hamiltonian classical-field method. We consider a quasi-two-dimensional

condensate containing a single vortex in equilibrium with a rotating thermal

cloud. Introducing an elliptical deformation of the trapping potential leads to

the loss of angular momentum from the system. We identify the condensate and

the complementary thermal component of the nonequilibrium field, and compare

the evolution of their angular momenta and angular velocities. By varying the

trap anisotropy we alter the relative efficiencies of the vortex-cloud and

cloud-trap coupling. For strong trap anisotropies the angular momentum of the

thermal cloud may be entirely depleted before the vortex begins to decay. For

weak trap anisotropies, the thermal cloud exhibits a long-lived steady state in

which it rotates at an intermediate angular velocity.

\\ ( http://arxiv.org/abs/0909.1683 , 279kb)

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\\

arXiv:0909.1714

Date: Wed, 9 Sep 2009 14:23:49 GMT (419kb)

Title: Effects of interaction on the diffusion of atomic matter waves in

one-dimensional quasi-periodic potentials

Authors: Marco Larcher, Franco Dalfovo, Michele Modugno

Categories: cond-mat.quant-gas

\\

We study the behaviour of an ultracold atomic gas of bosons in a bichromatic

lattice, where the weaker lattice is used as a source of disorder. We

numerically solve a discretized mean-field equation, which generalizes the

one-dimensional Aubry-Andr\`e model for particles in a quasi-periodic potential

by including the interaction between atoms. We compare the results for

commensurate and incommensurate lattices. We investigate the role of the

initial shape of the wavepacket as well as the interplay between two competing

effects of the interaction, namely self-trapping and delocalization. Our

calculations show that, if the condensate initially occupies a single lattice

site, the dynamics of the interacting gas is dominated by self-trapping in a

wide range of parameters, even for weak interaction. Conversely, if the

diffusion starts from a Gaussian wavepacket, self-trapping is significantly

suppressed and the destruction of localization by interaction is more easily

observable.

\\ ( http://arxiv.org/abs/0909.1714 , 419kb)

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\\

arXiv:0909.1660

Date: Wed, 9 Sep 2009 09:49:14 GMT (166kb)

Title: Matter-wave dark solitons: stochastic vs. analytical results

Authors: S.P. Cockburn, H.E. Nistazakis, T.P. Horikis, P.G. Kevrekidis, N.P.

Proukakis, D.J. Frantzeskakis

Categories: cond-mat.quant-gas cond-mat.other

Comments: 4 pages, 3 figures

\\

The dynamics of dark matter-wave solitons in elongated atomic condensates are

discussed at finite temperatures. Simulations with the stochastic

Gross-Pitaevskii equation reveal a noticeable, experimentally observable spread

in individual soliton trajectories, attributed to inherent fluctuations in both

phase and density of the underlying medium. Averaging over a number of such

trajectories (as done in experiments) washes out such background fluctuations,

revealing a well-defined temperature-dependent temporal growth in the

oscillation amplitude. The average soliton dynamics is well captured by the

simpler dissipative Gross-Pitaevskii equation, both numerically and via an

analytically-derived equation for the soliton center based on perturbation

theory for dark solitons.

\\ ( http://arxiv.org/abs/0909.1660 , 166kb)

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\\

arXiv:0909.1845

Date: Wed, 9 Sep 2009 22:56:32 GMT (1343kb)

Title: A Superglass Phase of Interacting Bosons

Authors: Ka-Ming Tam, Scott Geraedts, Stephen Inglis, Michel J. P. Gingras and

Roger G. Melko

Categories: cond-mat.dis-nn

Comments: 5 pages 3 figures

\\

Despite the simplicity of its constituent atoms, the phase diagram of bulk

helium has proven to be compelling and controversial -- especially in light of

recent observations of supersolid behavior in the crystal phase of Helium-4.

Several experiments have shown that superflow is enhanced by imperfections in

the crystal lattice, such as roaming defects and interstitial atoms. Most

strikingly, new experiments by Davis and collaborators have suggested that the

onset of superflow is intimately tied to relaxation dynamics characteristic of

glassy, or amorphous, solids. In this work, we examine the relationship between

superflow and glassiness in a boson lattice model, and demonstrate that simple

random disordered interactions can promote a stable superglass phase in a

system of Bose particles. In this superglass, superflow and glassy density

localization coexist in equilibrium without exhibiting phase separation.

\\ ( http://arxiv.org/abs/0909.1845 , 1343kb)

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\\

arXiv:0909.1649

Date: Wed, 9 Sep 2009 08:33:21 GMT (22kb)

Title: Partition function of a bubble formed in double stranded DNA

Authors: Yashwant Singh

Categories: cond-mat.soft cond-mat.stat-mech

Comments: 9 Pages, 1 figure. Submitted to Euro. Phys. Letter on 16th July 2009

\\

We calculate the entropic part of partition function of a bubble embedded in

a double stranded DNA (dsDNA) by considering the total weights of possible

configurations of a system of two single stranded DNA (ssDNA) of given length

which start from a point along the contour of dsDNA and reunite at a position

vector {\bf r} measured from the first point and the distribution function of

the position vector {\bf r} which separates the two zipper forks of the bubble

in dsDNA. For the distribution function of position vector {\bf r} we use the

distribution of the end-to-end vector {\bf r} of strands of given length of

dsDNA found from the wormlike chain model. We show that when the chains forming

the bubble are assumed to be Gaussian the so called loop closure exponent $c$

is 3 and when we made correction by including self avoidence in each chain the

value of $c$ becames 3.2.

\\ ( http://arxiv.org/abs/0909.1649 , 22kb)

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\\

arXiv:0909.1949

Date: Thu, 10 Sep 2009 13:52:02 GMT (179kb)

Title: A multi-photon magneto-optical trap

Authors: Saijun Wu, Thomas Plisson, Roger Brown, William D. Phillips and J. V.

Porto

Categories: physics.atom-ph

Comments: 10 pages, 5 figures

\\

We demonstrate a Magneto-Optical Trap (MOT) configuration which employs

optical forces due to light scattering between electronically excited states of

the atom. With the standard MOT laser beams propagating along the {\it x}- and

{\it y}- directions, the laser beams along the {\it z}-direction are at a

different wavelength that couples two sets of {\it excited} states. We

demonstrate efficient cooling and trapping of cesium atoms in a vapor cell and

sub-Doppler cooling on both the red and blue sides of the two-photon resonance.

The technique demonstrated in this work may have applications in

background-free detection of trapped atoms, and in assisting laser-cooling and

trapping of certain atomic species that require cooling lasers at inconvenient

wavelengths.

\\ ( http://arxiv.org/abs/0909.1949 , 179kb)

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\\

arXiv:0909.1958

Date: Thu, 10 Sep 2009 14:25:07 GMT (140kb)

Title: Cavity QED nondemolition measurement scheme using quantized atomic

motion

Authors: Jonas Larson and Mahmoud Abdel-Aty

Categories: quant-ph

Comments: 7 pages, 7 figures

\\

Considering ultracold atoms traversing a high-Q Fabry-Perot cavity, we

theoretically demonstrate a quantum nondemolition measurement of the photon

number. This fully quantum mechanical approach may be understood utilizing

concepts as effective mass and group velocity of the atom. The various photon

numbers induce a splitting of the atomic wave packet, and a time-of-flight

measurement of the atom thereby reveals the photon number. While repeated

atomic measurements increase the efficiency of the protocol, it is shown that

by considering long interaction times only a few atoms are needed to resolve

the photon number with almost perfect accuracy.

\\ ( http://arxiv.org/abs/0909.1958 , 140kb)

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\\

arXiv:0909.1898

Date: Thu, 10 Sep 2009 09:09:03 GMT (186kb)

Title: Finite-temperature phase transitions in quasi-two-dimensional spin-1

Bose gases

Authors: Ville Pietil\"a, Mikko M\"ott\"onen, and Tapio P. Simula

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures

\\

Recently, the Berezinskii-Kosterlitz-Thouless transition was found to be

mediated by half-quantum vortices (HQVs) in two-dimensional (2D)

antiferromagnetic Bose gases [Phys. Rev. Lett. 97, 120406 (2006)]. We study the

thermal activation of HQVs in the experimentally relevant trapped quasi-2D

systems and find that the crossover temperature is shifted upwards if skyrmions

are allowed. Above the defect binding temperatures we observe transitions

corresponding to the onset of a coherent condensate and a quasi-condensate and

discuss the absence of a fragmented condensate.

\\ ( http://arxiv.org/abs/0909.1898 , 186kb)

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\\

arXiv:0909.1871

Date: Thu, 10 Sep 2009 05:45:24 GMT (2163kb)

Title: Transition from Band insulator to Bose-Einstein Condensate superfluid

and Mott State of Cold Fermi Gases with Multiband Effects in Optical Lattices

Authors: Ryota Watanabe and Masatoshi Imada

Categories: cond-mat.quant-gas cond-mat.other

Comments: 13 pages, 10 figures

\\

We study two models realized by two-component Fermi gases loaded in optical

lattices. We clarify that multi-band effects inevitably caused by the optical

lattices generate a rich structure, when the systems crossover from the region

of weakly bound molecular bosons to the region of strongly bound atomic bosons.

Here the crossover can be controlled by attractive fermion interaction. One of

the present models is a case with attractive fermion interaction, where an

insulator-superfluid transition takes place. The transition is characterized as

the transition between a band insulator and a Bose-Einstein condensate (BEC)

superfluid state. Differing from the conventional BCS superfluid transition,

this transition shows unconventional properties. In contrast to the one

particle excitation gap scaled by the superfluid order parameter in the

conventional BCS transition, because of the multi-band effects, a large gap of

one-particle density of states is retained all through the transition although

the superfluid order grows continuously from zero. A reentrant transition with

lowering temperature is another unconventionality. The other model is the case

with coexisting attractive and repulsive interactions. Within a mean field

treatment, we find a new insulating state, an orbital ordered insulator. This

insulator is one candidate for the Mott insulator of molecular bosons and is

the first example that the orbital internal degrees of freedom of molecular

bosons appears explicitly. Besides the emergence of a new phase, a coexisting

phase also appears where superfluidity and an orbital order coexist just by

doping holes or particles. The insulating and superfluid particles show

differentiation in momentum space as in the high-Tc cuprate superconductors.

\\ ( http://arxiv.org/abs/0909.1871 , 2163kb)

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The replacements:

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arXiv:0909.0625

replaced with revised version Fri, 4 Sep 2009 07:06:56 GMT (123kb)

Title: Strong interaction regime of the nonlinear Landau-Zener problem for

photo- and magneto-association of cold atoms

Authors: R. Sokhoyan, H. Azizbekyan, C. Leroy, and A. Ishkhanyan

Categories: cond-mat.quant-gas

Comments: submitted to JETP (13 pages, 4 figures)

\\ ( http://arxiv.org/abs/0909.0625 , 123kb)

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\\

arXiv:0905.3541

replaced with revised version Fri, 4 Sep 2009 07:21:43 GMT (146kb)

Title: Dispersion Management of Ultraslow Light in a Bose-Einstein Condensate

via Trap Curvature

Authors: Devrim Tarhan, Seckin Sefi, and Ozgur E. Mustecaplioglu

Categories: physics.optics cond-mat.quant-gas quant-ph

Comments: 14 pages, 3 figures, some comments are added and the title of the

article is changed

\\ ( http://arxiv.org/abs/0905.3541 , 146kb)

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arXiv:0901.4951

replaced with revised version Mon, 7 Sep 2009 18:31:30 GMT (538kb,D)

Title: Perturbation theory for the Nonlinear Schroedinger Equation with a

random potential

Authors: Shmuel Fishman, Yevgeny Krivolapov and Avy Soffer

Categories: cond-mat.dis-nn

Comments: 30 pages, 7 figures, accepted to Nonlinearity

\\ ( http://arxiv.org/abs/0901.4951 , 538kb)

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\\

arXiv:0904.4372

replaced with revised version Mon, 7 Sep 2009 07:13:48 GMT (556kb)

Title: Simulating dense QCD matter with ultracold atomic boson-fermion mixtures

Authors: Kenji Maeda, Gordon Baym, and Tetsuo Hatsuda

Categories: cond-mat.quant-gas hep-ph nucl-th

Comments: 4 pages, 3 figures

Report-no: TKYNT-09-09

Journal-ref: Phys.Rev.Lett. 103, 085301 (2009)

\\ ( http://arxiv.org/abs/0904.4372 , 556kb)

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arXiv:0907.2743

replaced with revised version Tue, 8 Sep 2009 08:09:57 GMT (74kb)

Title: Propagation of Second sound in a superfluid Fermi gas in the unitary

limit

Authors: Emiko Arahata and Tetsuro Nikuni

Categories: cond-mat.quant-gas cond-mat.other

Comments: 15 pages, 8 figures

\\ ( http://arxiv.org/abs/0907.2743 , 74kb)

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\\

arXiv:0904.0244

replaced with revised version Tue, 8 Sep 2009 11:07:00 GMT (1418kb,D)

Title: A pump-probe study of the formation of rubidium molecules by ultrafast

photoassociation of ultracold atoms

Authors: David J. McCabe, Duncan G. England, Hugo E. L. Martay, Melissa E.

Friedman, Jovana Petrovic, Emiliya Dimova, B\'eatrice Chatel and Ian A.

Walmsley

Categories: physics.chem-ph physics.atom-ph physics.optics

Comments: Accepted for publication in Phys. Rev. A (10 pages, 9 figures)

Journal-ref: Phys. Rev. A 80, 033404 (2009)

DOI: 10.1103/PhysRevA.80.033404

\\ ( http://arxiv.org/abs/0904.0244 , 1418kb)

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arXiv:0904.0225

replaced with revised version Tue, 8 Sep 2009 12:24:20 GMT (2895kb)

Title: Demonstrating coherent control in 85Rb2 using ultrafast laser pulses: a

theoretical outline of two experiments

Authors: Hugo E. L. Martay, David J. McCabe, Duncan G. England, Melissa E.

Friedman, Jovana Petrovic, and Ian A. Walmsley

Categories: physics.atom-ph physics.chem-ph

Comments: 8 pages, 9 figures, PRA, 80, 033403 (2009)

Journal-ref: Phys. Rev. A, 80, 033403 (2009)

DOI: 10.1103/PhysRevA.80.033403

\\ ( http://arxiv.org/abs/0904.0225 , 2895kb)

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\\

arXiv:0906.0925

replaced with revised version Tue, 8 Sep 2009 21:01:13 GMT (95kb)

Title: Quantum mechanics in phase space: First order comparison between the

Wigner and the Fermi function

Authors: G. Benenti, G. Strini

Categories: quant-ph

Comments: 5 pages, 3 figures, added new data and discussion

\\ ( http://arxiv.org/abs/0906.0925 , 95kb)

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\\

arXiv:0908.4336

replaced with revised version Wed, 9 Sep 2009 13:11:20 GMT (171kb,D)

Title: Rayleigh-Taylor instability of binary condensates in axis symmetric

traps

Authors: S. Gautam and D. Angom

Categories: cond-mat.quant-gas

Comments: 4 pages, 3figures

\\ ( http://arxiv.org/abs/0908.4336 , 171kb)

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\\

arXiv:0812.5073 (*cross-listing*)

replaced with revised version Wed, 9 Sep 2009 13:19:04 GMT (3272kb)

Title: Bright and dark solitons in Bose-Einstein condensates

Authors: S. Rajendran, P. Muruganandam, M. Lakshmanan

Categories: nlin.PS cond-mat.other nlin.SI

Comments: 30 pages, 19 figures, 4 tables

\\ ( http://arxiv.org/abs/0812.5073 , 3272kb)

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\\

arXiv:0905.1125

replaced with revised version Wed, 9 Sep 2009 01:32:30 GMT (1329kb)

Title: Supersolidity of cold-atom Bose-Fermi mixtures in optical lattices

Authors: Peter P. Orth, Doron L. Bergman, and Karyn Le Hur

Categories: cond-mat.quant-gas

Comments: Moved technical details to appendices. Enlarged list of references.

Corrected typos, new Figs.11 and 15. Final and published version

Journal-ref: Phys. Rev. A 80, 023624 (2009)

DOI: 10.1103/PhysRevA.80.023624

\\ ( http://arxiv.org/abs/0905.1125 , 1329kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Fri Nov 20 2009 - 18:56:16 EST

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