Volume 85, Number 1, January 2009
Article Number 10005
Number of page(s) 5
Section General
Published online 21 January 2009
EPL, 85 (2009) 10005
DOI: 10.1209/0295-5075/85/10005

Casimir forces in a quasi$\hbox{--} $one-dimensional trapped dilute Bose gas

Xiao-Lu Yu1, 2, Ran Qi2, Z. B. Li1 and W. M. Liu2

1   The State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University - Guangzhou 510275, China
2   Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100080, China

received 29 October 2008; accepted in final form 9 December 2008; published January 2009
published online 21 January 2009

We discuss a Casimir force due to zero-temperature quantum fluctuations in an interacting quasi$\hbox{--} $one-dimensional Bose-Einstein condensate (BEC). For the first time, we can investigate the effect of the trapping potential and the atom-atom interaction simultaneously both of which contribute to the Casimir force. Furthermore, we calculate the Casimir force due to thermal fluctuations at finite temperature. Finally, we speculate on some possible experimental realization and detection of the force in future experiments.

03.75.Kk - Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow.
05.30.Jp - Boson systems.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.

© EPLA 2009