Phys. Rev. D 72, 076002 (2005) [10 pages]Goldstone boson counting in linear sigma models with chemical potentialReceived 18 August 2005; published 7 October 2005 We analyze the effects of finite chemical potential on spontaneous breaking of internal symmetries within the class of relativistic field theories described by the linear sigma model. Special attention is paid to the emergence of “abnormal” Goldstone bosons with a quadratic dispersion relation. We show that their presence is tightly connected to nonzero density of the Noether charges, and formulate a general counting rule. The general results are demonstrated on an SU(3)×U(1) invariant model with an SU(3)-sextet scalar field, which describes one of the color-superconducting phases of QCD. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.076002
DOI:
10.1103/PhysRevD.72.076002
PACS:
11.30.Qc
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.