Infrared Behavior of Interacting Bosons at Zero Temperature
نویسندگان
چکیده
منابع مشابه
Infrared behavior in systems with a broken continuous symmetry: classical O(N) model versus interacting bosons.
In systems with a spontaneously broken continuous symmetry, the perturbative loop expansion is plagued by infrared divergences due to the coupling between transverse and longitudinal fluctuations. As a result, the longitudinal susceptibility diverges and the self-energy becomes singular at low energy. We study the crossover from the high-energy Gaussian regime, where perturbation theory remains...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1997
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.78.1612