unitary gas
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2020 ◽  
Vol 101 (4) ◽  
Author(s):  
Andrei Alexandru ◽  
Paulo F. Bedaque ◽  
Neill C. Warrington

2015 ◽  
Vol 93 (8) ◽  
pp. 830-835 ◽  
Author(s):  
Wytse van Dijk ◽  
Calvin Lobo ◽  
Allison MacDonald ◽  
Rajat K. Bhaduri

For real inverse temperature β, the canonical partition function is always positive, being a sum of positive terms. There are zeros, however, on the complex β plane that are called Fisher zeros. In the thermodynamic limit, the Fisher zeros coalesce into continuous curves. In case there is a phase transition, the zeros tend to pinch the real-β axis. For an ideal trapped Bose gas in an isotropic three-dimensional harmonic oscillator, this tendency is clearly seen, signalling Bose–Einstein condensation (BEC). The calculation can be formulated exactly in terms of the virial expansion with temperature-dependent virial coefficients. When the second virial coefficient of a strongly interacting attractive unitary gas is included in the calculation, BEC seems to survive, with the condensation temperature shifted to a lower value for the unitary gas. This shift is consistent with a direct calculation of the heat capacity from the canonical partition function of the ideal and the unitary gas.


2012 ◽  
Vol 69 (2) ◽  
pp. 131-159 ◽  
Author(s):  
Domenico Finco ◽  
Alessandro Teta
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2007 ◽  
Vol 48 (12) ◽  
pp. 3146-3153 ◽  
Author(s):  
Yang Zhao ◽  
Zhao Haibo ◽  
Fang Zheng

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