Infrared features of unquenched finite temperature lattice Landau gauge QCD

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dc.creatorFurui, Sadataka
dc.creatorNakajima, Hideo
dc.date2006-12-11
dc.date2007-07-23
dc.date.accessioned2026-07-07T11:01:55Z
dc.date.available2026-07-07T11:01:55Z
dc.descriptionThe 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 $56^4$ $β=6.4$ and 6.45 lattices. The expectation value of the color antisymmetric ghost propagator $ϕ^c(q)$ 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.
dc.description11 pages 16 figures, version accepted for publication in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-lat/0612009
dc.identifierhttp://arxiv.org/abs/hep-lat/0612009
dc.identifierPhys.Rev.D76:054509,2007
dc.identifierdoi:10.1103/PhysRevD.76.054509
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188094
dc.subjectHigh Energy Physics - Lattice
dc.titleInfrared features of unquenched finite temperature lattice Landau gauge QCD
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