8,467 research outputs found
Temperature dependence of the axial magnetic effect in two-color quenched QCD
The Axial Magnetic Effect is the generation of an equilibrium dissipationless
energy flow of chiral fermions in the direction of the axial (chiral) magnetic
field. At finite temperature the dissipationless energy transfer may be
realized in the absence of any chemical potentials. We numerically study the
temperature behavior of the Axial Magnetic Effect in quenched SU(2) lattice
gauge theory. We show that in the confinement (hadron) phase the effect is
absent. In the deconfinement transition region the conductivity quickly
increases, reaching the asymptotic behavior in a deep deconfinement
(plasma) phase. Apart from an overall proportionality factor, our results
qualitatively agree with theoretical predictions for the behavior of the energy
flow as a function of temperature and strength of the axial magnetic field.Comment: 5 pages, 1 figur
Lattice QCD thermodynamics at finite chemical potential and its comparison with Experiments
We compare higher moments of baryon numbers measured at the RHIC heavy ion
collision experiments with those by the lattice QCD calculations. We employ the
canonical approach, in which we can access the real chemical potential regions
avoiding the sign problem. In the lattice QCD simulations, we study several
fits of the number density in the pure imaginary chemical potential, and
analyze how these fits affects behaviors at the real chemical potential. In the
energy regions between =19.6 and 200 GeV, the susceptibility
calculated at is consistent with experimental data at , while the kurtosis shows similar behavior with that of the
experimental data in the small regions . The
experimental data at 11.5 shows quite different behavior. The
lattice result in the deconfinement region,, is far from
experimental data
Temperature dependence of the axial magnetic effect in two-color quenched QCD
The axial magnetic effect is the generation of an equilibrium dissipationless energy flow of chiral fermions in the direction of the axial (chiral) magnetic field. At finite temperature the dissipationless energy transfer may be realized in the absence of any chemical potentials. We numerically study the temperature behavior of the axial magnetic effect in quenched SUd2_ lattice gauge theory. We show that in the confinement (hadron) phase the effect is absent. In the deconfinement transition region the conductivity quickly increases, reaching the asymptotic T2 behavior in a deep deconfinement (plasma) phase. Apart from an overall proportionality factor, our results qualitatively agree with theoretical predictions for the behavior of the energy flow as a function of temperature and strength of the axial magnetic field
Study of lattice QCD at finite baryon density using the canonical approach
At finite baryon density lattice QCD first-principle calculations can not be
performed due to the sign problem. In order to circumvent this problem, we use
the canonical approach, which provides reliable analytical continuation from
the imaginary chemical potential region to the real chemical potential region.
We briefly present the canonical partition function method, describe our
formulation, and show the results, obtained for two temperatures: and in lattice QCD with two flavors of improved Wilson
fermions.Comment: 8 pages, 4 figures, Contribution to XIIth Quark Confinement and the
Hadron Spectru
Axial magnetic effect in two-color quenched lattice QCD
The Axial Magnetic Effect manifests itself as an equilibrium energy flow of massless fermions induced by the axial (chiral) magnetic field. Here we study the Axial Magnetic Effect in the quenched SU(2) lattice gauge theory with massless overlap fermions at finite temperature. We numerically observe that in the low-temperature hadron phase the effect is absent due to the quark confinement. In the high-temperature deconfinement phase the energy flow is an increasing function of the temperature which reaches the predicted asymptotic T2 behavior at high temperatures. We find, however, that energy flow is about one order of magnitude lower compared to a theoretical prediction
Lattice QCD at finite baryon density using analytic continuation
We simulate lattice QCD with two flavors of Wilson fermions at imaginary
baryon chemical potential. Results for the baryon number density computed in
the confining and deconfining phases at imaginary baryon chemical potential are
used to determine the baryon number density and higher cumulants at the real
chemical potential via analytical continuation.Comment: 8 pages, 8 figures, Contribution to ICNFP2017, to be published in EPJ
Web of Conference
Phase structure of electroweak vacuum in a strong magnetic field: the lattice results
Using first-principle lattice simulations, we demonstrate that in the
background of a strong magnetic field (around 10^{20} T), the electroweak
sector of the vacuum experiences two consecutive crossover transitions
associated with dramatic changes in the zero-temperature dynamics of the vector
W bosons and the scalar Higgs particles, respectively. Above the first
crossover, we observe the appearance of large, inhomogeneous structures
consistent with a classical picture of the formation of W and Z condensates
pierced by vortices. The presence of the W and Z condensates supports the
emergence of the exotic superconducting and superfluid properties induced by a
strong magnetic field in the vacuum. We find evidence that the vortices form a
disordered solid or a liquid rather than a crystal. The second transition
restores the electroweak symmetry. Such conditions can be realized in the
near-horizon region of the magnetized black holes.Comment: 10 page
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