作者机构：
[Zhang, Zi-qiang; Chen, Gang] China Univ Geosci Wuhan, Sch Math & Phys, Wuhan 430074, Peoples R China.;[Hou, De-fu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, Zi-qiang] C;China Univ Geosci Wuhan, Sch Math & Phys, Wuhan 430074, Peoples R China.
关键词：
AdS/QCD;Heavy quark potential
摘要：
In this paper, we investigate the heavy quark potential in some holographic QCD models. The calculation relies on a modified renormalization scheme mentioned in a previous work of Albacete et al. After studying the heavy quark potential in Pirner-Galow model and Andreev-Zakharov model, we extend the discussion to a general deformed AdS5 case. It is shown that the obtained potential is negative definite for all quark-antiquark separations, differs from that using the usual renormalization scheme. (C) 2017 Elsevier B.V. All rights reserved.
作者机构：
[Wu, Yan; Ren, Hai-cang; Hou, De-fu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wu, Yan; Ren, Hai-cang; Hou, De-fu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Wu, Yan] China Univ Geosci, Sch Math & Phys, Wuhan 430074, Hubei, Peoples R China.;[Ren, Hai-cang] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.
通讯机构：
[Hou, De-fu] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
摘要：
We assess the applicability of the Wigner function formulation in its present form to the chiral magnetic effect and note some issues regarding the conservation and the consistency of the electric current in the presence of an inhomogeneous and time-dependent axial chemical potential. The problems are rooted in the ultraviolet divergence of the underlying field theory associated with the axial anomaly and can be fixed with the Pauli-Villars regularization of the Wigner function. The chiral magnetic current with a nonconstant axial chemical potential is calculated with the regularized Wigner function and the phenomenological implications are discussed.
摘要：
We study analytically the one-loop contribution to the chiral magnetic effect (CME) using lattice regularization with a Wilson fermion field. In the continuum limit, we find that the chiral magnetic current vanishes at nonzero temperature but emerges at zero temperature consistent with that found by Pauli-Villas regularization. For finite lattice size, however, the chiral magnetic current is nonvanishing at nonzero temperature. But the numerical value of the coefficient of CME current is very small compared with that extracted from the full QCD simulation for the same lattice parameters. The possibility of higher-order corrections from QCD dynamics is also assessed.
期刊：
Journal of High Energy Physics,2017年2017(4):1-32 ISSN：1029-8479
通讯作者：
Yin, Lei
作者机构：
[Yin, Lei; Lee, Ting-Kuo] Acad Sinica, Inst Phys, 128,Sec 2,Acad Rd, Taipei, Taiwan.;[Ren, Hai-cang] Rockefeller Univ, Phys Dept, 1230 York Ave, New York, NY 10021 USA.;[Hou, Defu; Ren, Hai-cang; Yin, Lei] Cent China Normal Univ, Inst Particle Phys, 152 Luoyu Rd, Wuhan, Peoples R China.;[Hou, Defu; Ren, Hai-cang; Yin, Lei] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOS, 152 Luoyu Rd, Wuhan, Peoples R China.
通讯机构：
[Yin, Lei] A;[Yin, Lei] C;Acad Sinica, Inst Phys, 128,Sec 2,Acad Rd, Taipei, Taiwan.;Cent China Normal Univ, Inst Particle Phys, 152 Luoyu Rd, Wuhan, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOS, 152 Luoyu Rd, Wuhan, Peoples R China.
关键词：
AdS-CFT Correspondence;Gauge-gravity correspondence;Holography and condensed matter physics (AdS/CMT)
摘要：
The static electric polarization of a holographic field theory dual to the Einstein-Maxwell theory in the background of AdS
4 with a Reissner-Nordström (AdS-RN) black hole is investigated. We prove that the holographic polarization is a meromorphic functions in complex momentum plane and locate analytically the asymptotic distribution of the poles along two straight lines parallel to the imaginary axis for a large momentum magnitude. The results are compared with the numerical result on Friedel-like poles of the same holographic model reported in the literature and with the momentum singularities of the one-loop polarization in weak-coupling spinor QED3 and scalar QED3 with the similarities and differences discussed.
摘要：
A calculation of the melting temperatures of heavy quarkonium states with the holographic potential was introduced in a previous work. In this paper, we consider the holographic potential at sub-leading order, which permits finite coupling corrections to be taken into account. It is found that this correction lowers the dissociation temperatures of heavy quarkonium.
作者机构：
[Feng, Bo] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China.;[Feng, Bo; Ren, Hai-cang; Hou, De-fu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Feng, Bo; Ren, Hai-cang; Hou, De-fu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Ren, Hai-cang] Rockefeller Univ, Dept Phys, 1230 York Ave, New York, NY 10021 USA.;[Wu, Ping-ping] Henan Polytech Univ, Sch Phys & Chem, Jiaozuo 454000, Peoples R China.
通讯机构：
[Feng, Bo] H;[Feng, Bo] C;Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
摘要：
The Bose-Einstein condensation of bound pairs made of equally and oppositely charged fermions in a magnetic field is investigated using a relativistic model. The Gaussian fluctuations have been taken into account in order to study the spectrum of bound pairs in the strong coupling region. We found, in the weak coupling region, that the condensation temperature increases with an increasing magnetic field displaying the magnetic catalysis effect. In the strong coupling region, the inverse magnetic catalysis appears when the magnetic field is low and is replaced by the usual magnetic catalysis effect when magnetic field is sufficiently high, in contrast to the nonrelativistic case where the inverse magnetic catalysis prevails in the strong coupling region regardless of the strength of the magnetic field. The resulting response to the magnetic field is the consequence of the competition between the dimensional reduction by Landau orbitals in pairing dynamics and the anisotropy of the kinetic spectrum of the bound pairs. We thus conclude that dimensional reduction dominates in the weak domain and strong coupling one except in the small magnetic field region, where the enhanced fluctuations dominate.
作者机构：
[Jiang, Bing-feng] Hubei Univ Nationalities, Ctr Theoret Phys, Enshi 445000, Hubei, Peoples R China.;[Jiang, Bing-feng] Hubei Univ Nationalities, Sch Sci, Enshi 445000, Hubei, Peoples R China.;[Li, Jia-rong; Hou, De-fu; Li, JR] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Hubei, Peoples R China.;[Li, Jia-rong; Hou, De-fu; Li, JR] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Jiang, Bing-feng] H;[Hou, DF; Li, JR] C;Hubei Univ Nationalities, Ctr Theoret Phys, Enshi 445000, Hubei, Peoples R China.;Hubei Univ Nationalities, Sch Sci, Enshi 445000, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Hubei, Peoples R China.
摘要：
We derive the electric permittivity ε and magnetic permeability μM of the quark-gluon plasma (QGP) with the kinetic theory associated with a Bhatnagar-Gross-Krook (BGK) collisional kernel. Based on them, we study the effect of collisions on the refractive index of QGP. Compared to the collisionless case, collisions change the ω-behavior of ε and μM dramatically, which is responsible for the fact that the real and imaginary parts of n2 and the Depine-Lakhtakia index nDL are smooth functions of ω. For a small collision rate ν, the Depine-Lakhtakia index nDL is negative in some frequency range. When the collision rate increases, the frequency range for nDL<0 becomes narrower. Numerical results show a critical collision rate ν∼0.2mD, above which the Depine-Lakhtakia index nDL is positive for all frequency regions, which indicates a normal refractive index. In contrast to the collisionless case, there exists some frequency range in which nDL<0 and the propagating mode may satisfy the dispersion relation n2ω2=k2 simultaneously, which implies the existence of a negative refractive index.
作者机构：
[Zhang, Le; Qin, Guang-You; Hou, De-Fu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Zhang, Le; Qin, Guang-You; Hou, De-Fu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Zhang, Le] Wuhan Univ Technol, Coll Post & Telecommun, Wuhan 430070, Peoples R China.
通讯机构：
[Qin, Guang-You] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
摘要：
We study the production of jet-bremsstrahlung photons through scattering with the constituents of dense nuclear matter within the framework of deep-inelastic scattering off a large nucleus. Applying a gradient expansion up to the second order for the exchanged three-dimensional momentum between jet and medium, we derive the single-photon bremsstrahlung spectrum with the inclusion of contributions from the transverse broadening as well as the longitudinal drag and diffusion of the hard parton's momentum. We also compare the medium-induced photon radiation spectra for single scattering and from the resummation of multiple scatterings. It is found that the coupling between different scatterings can give an additional contribution to medium-induced photon radiation, while for small momentum exchange the leading contribution from the drag and diffusions to the photon emission spectra remain the same for single and multiple scatterings.
关键词：
Chromohydrodynamics;Collisional energy loss;Dielectric function;Quark-gluon plasma;Shear viscosity
摘要：
When a heavy quark travels through the quark-gluon plasma, the polarization and fluctuating chromoelectric fields will be produced simultaneously in the plasma. The drag force due to those fields exerting in return on the moving heavy quark will cause energy change to it. Based on the dielectric functions derived from the viscous chromohydrodynamics, we have studied the collisional energy change of a heavy quark traversing the viscous quark-gluon plasma including fluctuations of chromoelectric field. Numerical results indicate that the chromoelectric field fluctuations lead to an energy gain of the moving heavy quark. Shear viscosity suppresses the fluctuation-induced energy gain and the viscous suppression effect for the charm quark is much more remarkable than that for the bottom quark. While, the fluctuation energy gain is much smaller than the polarization energy loss in magnitude and the net energy change for the heavy quark is at loss. (C) 2016 Elsevier B.V. All rights reserved.
摘要：
The Bose-Einstein condensation of bound pairs made of oppositely charged fermions in a magnetic field is investigated. We find that the condensation temperature shows the magnetic catalysis effect in weak coupling and the inverse magnetic catalysis effect in strong coupling. The different responses to the magnetic field can be attributed to the competition between the dimensional reduction by Landau orbitals in pairing dynamics and the anisotropy of the kinetic spectrum of fluctuations (bound pairs in the normal phase).
作者机构：
[Peng, G. X.; Xu, J. F.] Univ Chinese Acad Sci, Sch Phys, Beijing 101408, Peoples R China.;[Peng, G. X.] Inst High Energy Phys, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China.;[Hou, De-Fu; Liu, F.] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Hou, De-Fu; Liu, F.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Chen, Lie-Wen] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China.
通讯机构：
[Peng, G. X.] U;Univ Chinese Acad Sci, Sch Phys, 380 Huaibeizhen, Beijing 101408, Peoples R China.
摘要：
A quark model with running coupling and running strange quark mass, which is thermodynamically self-consistent at both high and lower densities, is presented and applied to study properties of strange quark matter and structure of compact stars. An additional term to the thermodynamic potential density is determined by meeting the fundamental differential equation of thermodynamics. It plays an important role in comparatively lower density and ignorable at extremely high density, acting as a chemical-potential dependent bag constant. In this thermodynamically enhanced perturbative QCD model, strange quark matter still has the possibility of being absolutely stable, while the pure quark star has a sharp surface with a maximum mass as large as about 2 times the solar mass and a maximum radius of about 11 kilometers.
作者机构：
[Hou, Defu; Ren, Hai-cang; Yin, Lei] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Hou, Defu; Ren, Hai-cang; Yin, Lei] Huazhong Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Ren, Hai-cang] Rockefeller Univ, Dept Phys, New York, NY 10021 USA.
通讯机构：
[Yin, Lei] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The general Ginzburg-Landau (GL) formulation of a holographic superconductor is developed near the transition temperature in the probe limit for two kinds of conformal dimension. elow the transition temperature, T<Tc, the order parameter scales with 1−TTc as expected. The analytical expressions of GL free energy in the grand canonical ensemble and the canonical ensemble are derived and the gradient term is studied. Furthermore this scaling coefficient of the order parameter takes different values in the grand canonical ensemble and the canonical ensemble, suggesting the strong coupling nature of the boundary field theory of the superconductivity.
