1,565 research outputs found
Energy-momentum tensor correlation function in Nf=2+1 full QCD at finite temperature
We measure correlation functions of the nonperturbatively renormalized
energy-momentum tensor in full QCD at finite temperature by applying
the gradient flow method both to the gauge and quark fields. Our main interest
is to study the conservation law of the energy-momentum tensor and to test
whether the linear response relation is properly realized for the entropy
density. By using the linear response relation we calculate the specific heat
from the correlation function. We adopt the nonperturbatively improved Wilson
fermion and Iwasaki gauge action at a fine lattice spacing fm. In this
paper the temperature is limited to a single value MeV. The ,
quark mass is rather heavy with while the quark mass is
set to approximately its physical value.Comment: 9 pages, 4 figures. Talk presented at the 35th International
Symposium on Lattice Field Theory (LATTICE 2017), 18-24 June 2017, Granada,
Spai
Block spin transformation on the dual lattice and monopole action
To find a perfect lattice action in terms of monopole action on the dual
lattice, we performed simulations of a monopole effective action obtained
numerically from vacuum configurations in SU(2) QCD. Although the Polyakov loop
behavior near is well reproduced by the action, a small but repulsive
term is needed in addition to get the string tension correctly. It is reported
also a monopole effective action in QCD which is expressed by one kind
of monopole currents.Comment: 4pages (4 figures), Latex, Contribution to Lattice 9
Monopole Condensation and Polyakov Loop in Finite-Temperature Pure QCD
We study the relation between the abelian monopole condensation and the
deconfinement phase transition of the finite-temperature pure QCD. The
expectation value of the monopole contribution to the Polyakov loop becomes
zero when a long monopole loop is distributed uniformly in the configuration of
the confinement phase. On the other hand, it becomes non-zero when the long
monopole loop disappears in the deconfinement phase. We also discuss the
relation between the monopole behaviors and the usual interpretation of the
spontaneous breaking of Z(N) symmetry in finite-temperature SU(N) QCD. It is
found that the boundary condition of the space direction is important to
understand the Z(N) symmetry in terms of the monopoles.Comment: 3 pages, latex, 8 figures, Talk presented at LATTICE96(topology
The (dual) Meissner effect in SU(2) and SU(3) QCD
After making an abelian projection in the maximally abelian gauge, we measure
the distribution of abelian electric flux and monopole currents around an
abelian Wilson loop in and QCD. The (dual) Meissner effect is
observed clearly. The vacua in the confinement phases of and
are both at around the border between type-1 and type-2 (dual) superconductor.Comment: 3 pages, to appear in the Proceedings of Lattice '9
Critical exponents and abelian dominance in QCD
The critical properties of the abelian Polyakov loop and the Polyakov loop in
terms of Dirac string are studied in finite temperature abelian projected
QCD. We evaluate the critical point and the critical exponents from
each Polyakov loop in the maximally abelian gauge using the finite-size scaling
analysis. Abelian dominance in this case is proved quantitatively. The critical
point of each abelian Polyakov loop is equal to that of the non-abelian
Polyakov loop within the statistical errors. Also, the critical exponents are
in good agreement with those from non-abelian Polyakov loops.Comment: 14 pages, latex, 4 figure
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