期刊：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,2009年36(4):045005- ISSN：0954-3899
通讯作者：
Feng, Bo
作者机构：
[Feng, Bo; Ren, Hai-cang; Hou, De-fu] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Ren, Hai-cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
通讯机构：
[Feng, Bo] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The angular momentum mixing in a non-spherical color superconductor (CSC) with a nonzero azimuthal quantum number and therefore violating time reversal invariance has been examined. The mixing is bound to occur because of the equal strength of the pairing potential mediated by one-gluon exchange for all partial waves to the leading-order QCD running coupling constant and the nonlinearity of the gap equation. The free energy with mixing is lower than that with p-wave pairing only, but still higher than that of the spherical color-spin-locked (CSL) state.
期刊：
Journal of High Energy Physics,2009年2009(8):004-004 ISSN：1029-8479
通讯作者：
Chu, Shao-xia
作者机构：
[Chu, Shao-xia; Hou, Defu; Ren, Hai-cang] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Ren, Hai-cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
通讯机构：
[Chu, Shao-xia] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
作者机构：
[Feng, Bo; Ren, Hai-cang; Hou, De-fu] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Ren, Hai-cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
通讯机构：
[Hou, De-fu] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We study the angular momentum mixing effects in the color superconductor with non-spherical pairing. We first clarify the concept of the angular momentum mixing with a toy model for non-relativistic and spinless fermions. Then we derive the gap equation for the polar phase of dense QCD by minimizing the CJT free energy. The solution of the gap equation consists of all angular momentum partial waves of odd parity. The corresponding free energy is found to be lower than that reported in the literature with p-wave only.
关键词：
shear viscosity;QGP;finite-temperature field theory;chemical potential
摘要：
Within the framework of finite temperature feld theory this paper discusses the shear viscosity of hot QED plasma through Kubo formula at one-loop skeleton diagram level with a finite chemical potential. The effective widths (damping rates) are introduced to regulate the pinch singularities and then gives a reliable estimation of the shear viscous coefficient. The finite chemical potential contributes positively compared to the pure temperature case. The result agrees with that from the kinetics theory qualitatively.
作者机构：
[Giannakis, Ioannis; Hou, Defu; Ren, Hai-cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;[Li, Jia-rong; Hou, Defu; Ren, Hai-cang] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Giannakis, Ioannis] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
通讯机构：
[Giannakis, Ioannis] R;Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
摘要：
We study the Anderson localization effect on the shear viscosity in a system with random medium by Kubo formula. We show that this effect can suppress nonperturbatively the shear viscosity and other transport coefficients. The possible relevancy of such a suppression to the near perfect fluid behavior of the quark-gluon plasma created in heavy-ion collisions is discussed.
摘要：
The quarkonium states in a quark-gluon plasma is examined with the heavy quark potential implied by the holographic principle. Both the vanila AdS-Schwarzschild metric and the one with an infrared cutoff are considered. The dissociation temperature is calculated by solving the Schrodinger equation of the potential model. In the case of the AdS-Schwarzschild metric with a IR cutoff, the ratios of the dissociation temperatures for J/psi and gamma with the U-ansatz of the potential to the deconfinement temperature are found to agree with the lattice results within a factor of two.
作者机构：
[Giannakis, Ioannis] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.;Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China.
通讯机构：
[Giannakis, Ioannis] R;Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
摘要：
We use the Ginzburg-Landau theory near the transition temperature in order to examine the behavior of an inhomogeneous superconductor in the presence of a magnetic field. We find that a transition from type-I to type-II superconductivity occurs. Furthermore we calculate the critical value of the mismatch and estimate the contributions of the fluctuations of the condensate and the higher-order terms in the Ginzburg-Landau framework.
期刊：
International Journal of Modern Physics E,2007年16(07n08):2256-2262 ISSN：0218-3013
通讯作者：
Giannakis, Ioannis
作者机构：
[Giannakis, Ioannis; Ren, Hai-Cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;[Hou, Defu; Li, Jia-Rong; Ren, Hai-Cang] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Giannakis, Ioannis] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
通讯机构：
[Giannakis, Ioannis] R;Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
会议名称：
19th International Conference on Ultra-Relativistic Necleus-Nucleus Collisions
会议时间：
NOV 14-20, 2006
会议地点：
Shanghai, PEOPLES R CHINA
会议主办单位：
[Giannakis, Ioannis;Ren, Hai-Cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.^[Hou, Defu;Li, Jia-Rong;Ren, Hai-Cang] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We study the Anderson Localization effect on the shear viscosity in a system with random medium by Kubo formula. We show that this effect can reduce the shear viscosity nonperturbatively. Then we discuss its possible implementation in heavy-ion collisions, where the created heavy bound states or other collective modes may play the role of the random scatterer underlying Anderson Localization effect.
作者机构：
Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.;Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China.;[Giannakis, Ioannis] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
通讯机构：
[Giannakis, Ioannis] R;Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
摘要：
In this letter we explore the Higgs instability in the gapless superfluid/superconducting phase. This is in addition to the (chromo)magnetic instability that is related to the fluctuations of the Nambu-Goldstone bosonic fields. While the latter may induce a single-plane-wave Larkin-Ovchinnikov-Fulde-Ferrel state, the Higgs instability favors spatial inhomogeneity. In the case of the 2-flavor color superconductivity state the Higgs instability can only be partially removed by the electric Coulomb energy. But this does not exclude the possibility that it can be completely removed in other exotic states such as the gapless color-flavor locked state.
作者机构：
Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China.;[Giannakis, Ioannis] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
通讯机构：
[Giannakis, Ioannis] R;Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
摘要：
The fluctuations of the Higgs and pseudo Nambu-Goldstone fields in the 2-flavor color superconductivity (2SC) phase with mismatched pairing are described in the nonlinear realization framework of the gauged Nambu-Jona-Lasinio model. In the gapless 2SC phase, not only Nambu-Goldstone currents can be spontaneously generated, but also the Higgs field exhibits instablity. The Nambu-Goldstone currents generation indicates the formation of the single plane wave Larkin-Ovchinnikov-Fulde-Ferrel state and breaks rotation symmetry, while the Higgs instability favors spatial inhomogeneity and breaks translation invariance. In this paper, we focus on the Higgs instability which has not drawn much attention yet. The Higgs instability cannot be removed without a long range force, thus it persists in the gapless superfluidity and induces phase separation. In the case of gapless 2-flavor color superconductivity state, the Higgs instability can only be partially removed by the electric Coulomb energy. However, it is not excluded that the Higgs instability might be completely removed in the charge neutral gapless color-flavor locked phase by the color Coulomb energy.
摘要：
We study the effects of gauge-field fluctuations on the free energy density of a homogeneous color superconductor in the color-flavor-locked (CFL) phase. Gluonic fluctuations induce a strong first-order phase transition, in contrast to electronic superconductors where this transition is weakly first order. The critical temperature for this transition is larger than the one corresponding to the diquark pairing instability. The physical reason is that the gluonic Meissner masses suppress long-wavelength fluctuations as compared to the normal conducting phase where gluons are massless, which stabilizes the superconducting phase. In weak coupling, we analytically compute the temperatures associated with the limits of metastability of the normal and superconducting phases, as well as the latent heat associated with the first-order phase transition. We then extrapolate our results to intermediate densities and numerically evaluate the temperature of the fluctuation-induced first-order phase transition, as well as the discontinuity of the diquark condensate at the critical point. We find that the London limit of magnetic interactions is absent in color superconductivity.
作者机构：
[Hou, De-fu] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
通讯机构：
[Hou, De-fu] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We clarify general properties of the energy gap regarding its functional dependence on the energy-momentum dictated by the invariance under a space inversion or a time reversal. Then we derive perturbltively the equation of the imaginary part of the gap function for dense QCD in weak coupling and generalize our results from 2SC case to CFL case. We confirm that the imaginary part is down by g relative to the real part in weak coupling. The numerical results show that, up to the leading order, the imaginary part is no larger than one MeV at extremely large densities and can be as large as several MeV for the densities of physical interest. (c) 2006 Elsevier B.V. All rights reserved.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2006年45(2):459-464 ISSN：1434-6044
通讯作者：
Liu, Hui
作者机构：
[Liu, Hui; Li, Jiarong; Hou, Defu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, Hui] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Viscosity;Field Theory;Elementary Particle;Quantum Field Theory;Shear Viscosity
摘要：
The shear viscosity of QED plasma at finite temperature and density is calculated by solving Boltzmann equation with variational approach. The result shows the small chemical potential enhances the viscosity in leading-log order by adding a chemical potential quadratic term to the viscosity for the pure temperature environment.
作者机构：
[Giannakis, I] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Giannakis, I] R;Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
摘要：
In this Letter we construct analytically a LOFF color superconducting state that is both color and charge neutral using the weak coupling approximation. We demonstrate that this state is free from chromomagnetic instabilities. Its relevance to the realistic quark matter at moderately high baryon density is discussed.
作者机构：
Rockefeller Univ, Dept Phys, New York, NY 10021 USA.;Goethe Univ Frankfurt, Inst Theoret Phys, D-60054 Frankfurt, Germany.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Giannakis, I] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
通讯机构：
[Giannakis, I] R;Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
摘要：
We study the gauge field fluctuations in dense quark matter and determine the temperature of the induced first-order phase transition to the color-superconducting phase in weak coupling. We find that the local approximation of the coupling between the gauge potential and the order parameter, employed in the Ginzburg-Landau theory, has to be modified by restoring the full momentum dependence of the polarization function of gluons in the superconducting phase.
