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Phys. Rev. A 65, 053606 (2002) [7 pages]

Bose-Einstein condensation in the presence of a uniform field and a pointlike impurity

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R. M. Cavalcanti*
Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, Rio de Janeiro, Brazil

P. Giacconi†, G. Pupillo‡, and R. Soldati§
Dipartimento di Fisica, Università di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, 40126 Bologna, Italy

Received 28 November 2001; published 23 April 2002

The behavior of an ideal D-dimensional boson gas in the presence of a uniform gravitational field is analyzed. It is explicitly shown that, contrary to a long-standing belief, the three-dimensional gas does not undergo Bose-Einstein condensation at finite temperature. On the other hand, Bose-Einstein condensation occurs at T≠0 for D=1,2,3 if there is a pointlike impurity at the bottom of the vessel containing the gas.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.053606
DOI:
10.1103/PhysRevA.65.053606
PACS:
03.75.Fi, 03.65.Ge, 05.30.Jp

*Email address: rmoritz@if.ufrj.br

†Email address: Paola.Giacconi@bo.infn.it

‡Present address: Laboratory for Physical Sciences, 8050 Greenmead Drive, College Park, MD 20740; email address: Guido.Pupillo@physics.umd.edu

§Email address: Roberto.Soldati@bo.infn.it

 
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