scholarly journals Persistent-current formation in a high-temperature Bose-Einstein condensate: An experimental test for classical-field theory

2013 ◽  
Vol 88 (6) ◽  
Author(s):  
S. J. Rooney ◽  
T. W. Neely ◽  
B. P. Anderson ◽  
A. S. Bradley
Keyword(s):  
Field Theory ◽  
High Temperature ◽  
Experimental Test ◽  
Classical Field Theory ◽  
Einstein Condensate ◽  
Classical Field ◽  
Persistent Current ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Exploring the thermodynamics of noncommutative scalar fields

2016 ◽  
Vol 31 (11) ◽  
pp. 1650057 ◽  
Author(s):  
Francisco A. Brito ◽  
Elisama E. M. Lima
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Thermodynamic Properties ◽  
Scalar Fields ◽  
Einstein Condensate ◽  
Target Space ◽  
Quantum Field ◽  
Condensate Fraction ◽  
Bose Einstein Condensate ◽  
Bose Einstein

We study the thermodynamic properties of the Bose–Einstein condensate (BEC) in the context of the quantum field theory with noncommutative target space. Our main goal is to investigate in which temperature and/or energy regimes the noncommutativity can characterize some influence on the BEC properties described by a relativistic massive noncommutative boson gas. The noncommutativity parameters play a key role in the modified dispersion relations of the noncommutative fields, leading to a new phenomenology. We have obtained the condensate fraction, internal energy, pressure and specific heat of the system and taken ultrarelativistic (UR) and nonrelativistic (NR) limits. The noncommutative effects on the thermodynamic properties of the system are discussed. We found that there appear interesting signatures around the critical temperature.

The weakly interacting Bose gas at the critical temperature

2019 ◽  
pp. 361-372
Author(s):  
Jean Zinn-Justin
Keyword(s):  
Field Theory ◽  
Phase Transition ◽  
Transition Temperature ◽  
Einstein Condensate ◽  
Einstein Condensation ◽  
Superfluid Phase ◽  
Bose Einstein Condensate ◽  
Repulsive Interactions ◽  
Euclidean Field Theory ◽  
Bose Einstein

Chapter 20 examines effects of weak repulsive interactions in a Bose–Einstein condensate and the transition from Bose–Einstein condensate to superfluid phase transition. Renormalization group methods are used and a universal amplitude is calculated by non–perturbative methods. After the discovery of the predicted Bose–Einstein condensation, which is a property of free bosons, an interesting issue was the effects of weak repulsive interactions. In this chapter, it is shown that, near the transition temperature, the initial non–relativistic field theory can be replaced by a relativistic effective Euclidean field theory known to describe a superfluid phase transition (a dimensional reduction). These theoretical considerations are illustrated by an evaluation of the universal variation of the transition temperature at weak coupling. For this purpose, the O(2) symmetry of the model is generalized to O(N) symmetry, and large N techniques are used.

scholarly journals Nonequilibrium Field Theory Description of the Bose-Einstein Condensate

2000 ◽  
Vol 85 (3) ◽  
pp. 479-482 ◽  
Author(s):  
Daniel G. Barci ◽  
E. S. Fraga ◽  
Rudnei O. Ramos
Keyword(s):  
Field Theory ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein
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