1,673 research outputs found
Comment to: "A note on failure of the ladder approximation to QCD" [Phys. Lett. B 640 (2006) 196 ]
In the paper [Hong-Shi Zong, Wei-Min Sun, Phys. Lett. B 640 (2006) 196], the
authors claim that our proof of the inconsistency of the ladder approximation
to QCD [Phys. Lett. B 611 (2005) 129] was incorrect. However, their claim is
based on a derivation which contains a rough mathematical mistake, namely the
unjustified change of variables in the divergent (though regularized)
integrals. In this comment I will show this explicitly, so our conclusion that
the ladder approximation to QCD is inconsistent remains, of course, correct.Comment: 2 pages, no figure, no table
A thermodynamically consistent quasi-particle model without density-dependent infinity of the vacuum zero point energy
In this paper, we generalize the improved quasi-particle model proposed in J.
Cao et al., [ Phys. Lett. B {\bf711}, 65 (2012)] from finite temperature and
zero chemical potential to the case of finite chemical potential and zero
temperature, and calculate the equation of state (EOS) for (2+1) flavor Quantum
Chromodynamics (QCD) at zero temperature and high density. We first calculate
the partition function at finite temperature and chemical potential, then go to
the limit and obtain the equation of state (EOS) for cold and dense QCD,
which is important for the study of neutron stars. Furthermore, we use this EOS
to calculate the quark-number density, the energy density, the quark-number
susceptibility and the speed of sound at zero temperature and finite chemical
potential and compare our results with the corresponding ones in the existing
literature
Supercurrent in p-wave Holographic Superconductor
The p-wave and -wave holographic superconductors with fixed DC
supercurrent are studied by introducing a non-vanishing vector potential. We
find that close to the critical temperature of zero current, the
numerical results of both the p wave model and the model are the same as
those of Ginzburg-Landau (G-L) theory, for example, the critical current and the phase transition in the presence of a DC current is
a first order transition. Besides the similar results between both models, the
superconductor shows isotropic behavior for the supercurrent, while the
p-wave superconductor shows anisotropic behavior for the supercurrent.Comment: Version 4. 18 pages, 9figures. New results of the anisotropic
behavior for the supercurrent in p-wave model added. Accepted by PR
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