Infrared Behavior of Interacting Bosons at Zero Temperature
Condensed Matter
2009-10-28 v2
Abstract
We exploit the symmetries associated with the stability of the superfluid phase to solve the long-standing problem of interacting bosons in the presence of a condensate at zero temperature. Implementation of these symmetries poses strong conditions on the renormalizations that heal the singularities of perturbation theory. The renormalized theory gives: For d>3 the Bogoliubov quasiparticles as an exact result; for 1<d<=3 a nontrivial solution with the exact exponent for the singular longitudinal correlation function, with phonons again as low-lying excitations.
Cite
@article{arxiv.cond-mat/9604076,
title = {Infrared Behavior of Interacting Bosons at Zero Temperature},
author = {C. Castellani and C. Di Castro and F. Pistolesi and G. C. Strinati},
journal= {arXiv preprint arXiv:cond-mat/9604076},
year = {2009}
}
Comments
Minor Changes. 4 pages, RevTeX, no figures, uses multicol.sty e-mail: pistoles@ill.fr