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SUMMARY:Bose and Fermi Excitations in Hot and Dense QCD
DTSTART;VALUE=DATE-TIME:19990218T110000Z
DTEND;VALUE=DATE-TIME:19990218T120000Z
DTSTAMP;VALUE=DATE-TIME:20260702T041538Z
UID:indico-event-1110@indico.ific.uv.es
DESCRIPTION:The spectra of Bose and Fermi excitations are reviewed in hot 
 and dense Abelian and non-Abelian theories for different gauges. Due to th
 e medium all these spectra are multi-split and their branches have\, as a 
 rule\, the finite energy gap at zero momentum (the effective thermal mass)
 . The Bose (gluon or photon) spectra always have three branches (two trans
 versal and one longitudinal) with the equal thermal masses proportional gT
 . The Fermi spectra have four or more branches which are very sensitive to
  the chosen gauge and the values of the m\,\\mu-parameters. Usually there 
 are two one-particle (perturbative) branches and four collective ones: two
  branches represent the massive quasi-particle excitations with the usual 
 properties and the other two - quasi-hole ones which occur only in the med
 ium. The problem of gauge invariance which stays especially sharply for al
 l Fermi spectra remains unsolved and we only demonstrate this difficulty c
 omparing a number of the calculational results in the Feynman and Coulomb 
 gauges.\n\nhttps://indico.ific.uv.es/event/1110/
LOCATION:Dpto. de Fisica Teorica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1110/
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