Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2006-12-11
Phys.Rev.D76:054509,2007
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages 16 figures, version accepted for publication in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.76.054509
The color diagonal and color antisymmetric ghost propagators slightly above $T_c$ of $N_f=2$ MILC $24^3\times 12$ lattices are measured and compared with zero temperature unquenched $N_f=2+1$ MILC$_c$ $20^3\times 64$ and MILC$_f$ $28^3\times 96$ lattices and zero temperature quenched $56^4$ $\beta=6.4$ and 6.45 lattices. The expectation value of the color antisymmetric ghost propagator $\phi^c(q)$ is zero but its Binder cumulant, which is consistent with that of $N_c^2-1$ dimensional Gaussian distribution below $T_c$, decreases above $T_c$. Although the color diagonal ghost propagator is temperature independent, the $l^1$ norm of the color antisymmetric ghost propagator is temperature dependent. The expectation value of the ghost condensate observed at zero temperature unquenched configuration is consistent with 0 in $T>T_c$. We also measure transverse, magnetic and electric gluon propagator and extract gluon screening masses. The running coupling measured from the product of the gluon dressing function and the ghost dressing function are almost temperature independent but the effect of $A^2$ condensate observed at zero temperature is consistent with 0 in $T>T_c$. The transverse gluon dressing function at low temperature has a peak in the infrared but it becomes flatter at high temperature. Its absolute value in the high momentum is larger for high temperature and similar to the magnetic gluon dressing function. The electric gluon propagator at high momentum is temperature independent. These data imply that the magnetic gluon propagator and the color antisymmetric ghost propagator are affected by the presence of dynamical quarks and there are strong non-perturbative effects through the temperature dependent color anti-symmetric ghost propagator.
Furui Sadataka
Nakajima Hideo
No associations
LandOfFree
Infrared features of unquenched finite temperature lattice Landau gauge QCD does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Infrared features of unquenched finite temperature lattice Landau gauge QCD, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared features of unquenched finite temperature lattice Landau gauge QCD will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-182994