488 research outputs found
Dual Higgs Mechanism for Quarks in Hadrons
We study nonperturbative features of QCD using the dual Ginzburg-Landau (DGL)
theory, where the color confinement is realized through the dual Higgs
mechanism brought by QCD-monopole condensation. The linear confinement
potential appears in the QCD-monopole condensed vacuum. We study the infrared
screening effect to the confinement potential by the light-quark pair creation,
and derive a compact formula for the screened quark potential. We study the
dynamical chiral-symmetry breaking (DSB) in the DGL theory by solving
the Schwinger-Dyson equation. QCD-monopole condensation plays an essential role
to DSB. The QCD phase transition at finite temperature is studied using
the effective potential formalism in the DGL theory. We find the reduction of
QCD-monopole condensation and the string tension at high temperatures. The
surface tension is calculated using the effective potential at the critical
temperature. The DGL theory predicts a large mass reduction of glueballs near
the critical temperature. We apply the DGL theory to the quark-gluon-plasma
(QGP) physics in the ultrarelativistic heavy-ion collisions. We propose a new
scenario of the QGP formation via the annihilation of color-electric flux tubes
based on the attractive force between them.Comment: Talk presented by H. Suganuma at the YITP Workshop on 'From Hadronic
Matter to Quark Matter: Evolving View of Hadronic Matter', Oct. 30-Nov. 1,
1994, YITP Kyoto, Japan, 20 pages, uses PHYZZX (to be published in Prog.
Theor. Phys. Suppl.)
Dirac spectrum representation of Polyakov loop fluctuations in lattice QCD
Dirac spectrum representations of the Polyakov loop fluctuations are derived
on the temporally odd-number lattice, where the temporal length is odd with the
periodic boundary condition. We investigate the Polyakov loop fluctuations
based on these analytical relations. It is semianalytically and numerically
found that the low-lying Dirac eigenmodes have little contribution to the
Polyakov loop fluctuations, which are sensitive probe for the quark
deconfinement. Our results suggest no direct one-to-one corresponding between
quark confinement and chiral symmetry breaking in QCD.Comment: 7 pages and 1 figure. Proceeding of the 33rd International Symposium
on Lattice Field Theory (Lattice 2015), 14-18 July 2015, Kobe International
Conference Center, Kobe, Japan. Also regarded as the Proceeding of the 4th
International Conference on new Frontiers in Physics (ICNFP 2015), 23-30
August 2015, Conference Center of the Orthodox Academy of Crete, Crete,
Greec
Relating Quark Confinement and Chiral Symmetry Breaking in QCD
We study the relation between quark confinement and chiral symmetry breaking
in QCD. Using lattice QCD formalism, we analytically express the various
"confinement indicators", such as the Polyakov loop, its fluctuations, the
Wilson loop, the inter-quark potential and the string tension, in terms of the
Dirac eigenmodes. In the Dirac spectral representation, there appears a power
of the Dirac eigenvalue such as , which behaves
as a reduction factor for small . Consequently, since this reduction
factor cannot be cancelled, the low-lying Dirac eigenmodes give negligibly
small contribution to the confinement quantities,while they are essential for
chiral symmetry breaking. These relations indicate no direct, one-to-one
correspondence between confinement and chiral symmetry breaking in QCD. In
other words, there is some independence of quark confinement from chiral
symmetry breaking, which can generally lead to different transition
temperatures/densities for deconfinement and chiral restoration. We also
investigate the Polyakov loop in terms of the eigenmodes of the Wilson, the
clover and the domain-wall fermion kernels, respectively, and find the similar
results. The independence of quark confinement from chiral symmetry breaking
seems to be natural, because confinement is realized independently of quark
masses and heavy quarks are also confined even without the chiral symmetry.Comment: 20 pages, 10 figures. arXiv admin note: text overlap with
arXiv:1611.0874
Local Electronic Function Shift in LSI Chips Stacked Three-Dimensionally by Area-Arrayed Bump Structures Caused by the Local Deformation of the Laminated Chips
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