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Bose-Einstein condensation in the three-sphere and in the infinite slab: Analytical results

Lookup NU author(s): Professor David Toms

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Abstract

We study the finite size effects on Bose-Einstein condensation (BEC) of an ideal non-relativistic Bose gas in the three-sphere (spatial section of the Einstein universe) and in a partially finite box which is infinite in two of the spatial directions (infinite slab). Using the framework of grand-canonical statistics, we consider the number of particles, the condensate fraction and the specific heat. After obtaining asymptotic expansions for large system size, which are valid throughout the BEC regime, we describe analytically how the thermodynamic limit behaviour is approached. In particular, in the critical region of the BEC transition, we express the chemical potential and the specific heat as simple explicit functions of the temperature, highlighting the effects of finite size. These effects are seen to be different for the two different geometries. We also consider the Bose gas in a one-dimensional box, a system which does not possess BEC in the sense of a phase transition even in the infinite volume limit. (C) 2013 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Noronha JMB, Toms DJ

Publication type: Article

Publication status: Published

Journal: Physica A: Statistical Mechanics and its Applications

Year: 2013

Volume: 392

Issue: 18

Pages: 3984-3996

Print publication date: 15/09/2013

Online publication date: 29/04/2013

Acceptance date: 22/03/2013

ISSN (print): 0378-4371

ISSN (electronic): 1873-2119

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.physa.2013.04.039

DOI: 10.1016/j.physa.2013.04.039

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