scholarly journals Infrared behavior and spectral function of a Bose superfluid at zero temperature

2009 ◽  
Vol 80 (4) ◽  
Author(s):  
N. Dupuis
Keyword(s):  
Spectral Function ◽  
Zero Temperature ◽  
Infrared Behavior ◽  
Bose Superfluid

Exact infrared behavior of superfluid interacting bosons at zero temperature

1997 ◽  
Vol 282-287 ◽  
pp. 1821-1822
Author(s):  
C. Castellani ◽  
C. Di Castro ◽  
F. Pistolesi ◽  
G.C. Strinati
Keyword(s):  
Zero Temperature ◽  
Infrared Behavior

scholarly journals Effective field theory of the Higgs mode in a two-dimensional dilute Bose gas

2021 ◽  
Author(s):  
Ji-Chong Yang ◽  
Yu Shi
Keyword(s):  
Field Theory ◽  
Spectral Function ◽  
Effective Field Theory ◽  
Temperature Limit ◽  
Bose Gas ◽  
Effective Field ◽  
Two Dimensional ◽  
Zero Temperature ◽  
Text Model ◽  
Higgs Mode

In this paper, we investigate the spectral function of the Higgs mode in a two-dimensional Bose gas by using the effective field theory in the zero-temperature limit. Our approach explains the experimental feature that the peak of the spectral function is a soft continuum rather than a sharp peak, broadens and vanishes in the superfluid phase, which cannot be explained in terms of the [Formula: see text] model. We also find that the scalar susceptibility is the same as the longitudinal susceptibility.

scholarly journals Infrared behavior of interacting bosons at zero temperature

Laser Physics ◽  
2011 ◽  
Vol 21 (8) ◽  
pp. 1470-1479 ◽  
Author(s):  
N. Dupuis ◽  
A. Rançon
Keyword(s):  
Zero Temperature ◽  
Infrared Behavior

scholarly journals Infrared Behavior of Interacting Bosons at Zero Temperature

1997 ◽  
Vol 78 (9) ◽  
pp. 1612-1615 ◽  
Author(s):  
C. Castellani ◽  
C. Di Castro ◽  
F. Pistolesi ◽  
G. C. Strinati
Keyword(s):  
Zero Temperature ◽  
Infrared Behavior

scholarly journals INFRARED BEHAVIOR OF INTERACTING BOSONS AT ZERO TEMPERATURE

2011 ◽  
Vol 25 (12n13) ◽  
pp. 963-971
Author(s):  
N. DUPUIS
Keyword(s):  
Perturbation Theory ◽  
Renormalization Group ◽  
Correlation Functions ◽  
Zero Temperature ◽  
Infrared Behavior ◽  
Bogoliubov Approximation ◽  
Perturbative Renormalization ◽  
Infrared Divergences

We review the infrared behavior of interacting bosons at zero temperature. After a brief discussion of the Bogoliubov approximation and the breakdown of perturbation theory due to infrared divergences, we show how the non-perturbative renormalization group enables to obtain the exact infrared behavior of the correlation functions.

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