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Title: Ground state of gapless two flavor color superconductors

Abstract

This paper is devoted to the study of some aspects of the instability of two flavor color-superconductive quark matter. We find that, beside color condensates, the Goldstone boson related to the breaking of U(1){sub A} suffers from a velocity instability. We relate this wrong sign problem, which implies the existence of a Goldstone current in the ground state or of gluonic condensation, to the negative squared Meissner mass of the 8th gluon in the gapless two flavor color superconductor (g2SC) phase. Moreover we investigate the Meissner masses of the gluons and the squared velocity of the Goldstone in the multiple-plane-wave Larkin-Ovchinnikov-Fulde-Ferrel (LOFF) states, arguing that in such phases both the chromomagnetic instability and the velocity instability are most probably removed. We also do not expect Higgs instability in such multiple-plane-wave LOFF, at least when one considers fluctuations with small momenta. The true vacuum of gapless two flavor superconductors is thus expected to be a multiple-plane-wave LOFF state.

Authors:
;  [1];  [2]
  1. Depart. de Physique Theorique, Universite de Geneve, CH-1211 Geneva 4 (Switzerland)
  2. (Italy)
Publication Date:
OSTI Identifier:
20929543
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.75.114004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COLOR MODEL; FLAVOR MODEL; GLUONS; GOLDSTONE BOSONS; GROUND STATES; HIGGS MODEL; INSTABILITY; MASS; QUARK MATTER; SUPERCONDUCTORS; U-1 GROUPS; WAVE PROPAGATION

Citation Formats

Gatto, R., Ruggieri, M., and Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Italy and INFN, Sezione di Bari, I-70126 Bari. Ground state of gapless two flavor color superconductors. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.114004.
Gatto, R., Ruggieri, M., & Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Italy and INFN, Sezione di Bari, I-70126 Bari. Ground state of gapless two flavor color superconductors. United States. doi:10.1103/PHYSREVD.75.114004.
Gatto, R., Ruggieri, M., and Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Italy and INFN, Sezione di Bari, I-70126 Bari. Fri . "Ground state of gapless two flavor color superconductors". United States. doi:10.1103/PHYSREVD.75.114004.
@article{osti_20929543,
title = {Ground state of gapless two flavor color superconductors},
author = {Gatto, R. and Ruggieri, M. and Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Italy and INFN, Sezione di Bari, I-70126 Bari},
abstractNote = {This paper is devoted to the study of some aspects of the instability of two flavor color-superconductive quark matter. We find that, beside color condensates, the Goldstone boson related to the breaking of U(1){sub A} suffers from a velocity instability. We relate this wrong sign problem, which implies the existence of a Goldstone current in the ground state or of gluonic condensation, to the negative squared Meissner mass of the 8th gluon in the gapless two flavor color superconductor (g2SC) phase. Moreover we investigate the Meissner masses of the gluons and the squared velocity of the Goldstone in the multiple-plane-wave Larkin-Ovchinnikov-Fulde-Ferrel (LOFF) states, arguing that in such phases both the chromomagnetic instability and the velocity instability are most probably removed. We also do not expect Higgs instability in such multiple-plane-wave LOFF, at least when one considers fluctuations with small momenta. The true vacuum of gapless two flavor superconductors is thus expected to be a multiple-plane-wave LOFF state.},
doi = {10.1103/PHYSREVD.75.114004},
journal = {Physical Review. D, Particles Fields},
number = 11,
volume = 75,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}