Speaker
Ernst-Michael Ilgenfritz
(JINR, BLTP)
Description
I will report on an attempt to fix the gluon spectral functions at finite
temperature in Landau gauge. Our study used a novel Bayesiann approach
for the extraction of non-positive definite spectral functions.
The spectral functions are extracted at three different lattice spacing.
For each of them, a scan of temperatures around the crossover transition
is carried out.
There are indications for the existence of a well defined quasi-particle
peak. Due to a relatively small number of imaginary frequencies available,
we focus on the momentum and temperature dependence of the peak position
while the width is beyond our present possibilities.
The dispersion relation reveals different in-medium masses for longitudinal
and transversal gluons at high temperatures, in agreement with weak
coupling expectations.
Primary author
Ernst-Michael Ilgenfritz
(JINR, BLTP)
Co-authors
Dr
Alexander Rothkopf
(ITP, Heidelberg University)
Dr
Anton M. Trunin
(JINR, BLTP)
Dr
Jan M. Pawlowski
(ITP, Heidelberg University)
