Zi-qiang Zhang

The effect of chemical potential on imaginary potential and entropic force

Abstract Imaginary potential and entropic force represent different mechanisms for melting the heavy quarkonium. In this paper, we study the chemical potential effect on these two quantities with respect to a moving quarkonium from the AdS/CTF duality. We observe that for both mechanisms the chemical potential has the same effect: the presence of the chemical potential tends to decrease the dissociation length.

R2 Corrections to the Jet Quenching Parameter

A calculation of corrections to the jet quenching parameter from AdS/CFT correspondence is presented. It is shown that these corrections will increase or decrease the jet quenching parameter depending on the coefficients of the high curvature terms.

Heavy quark potential and jet quenching parameter in a D-instanton background

Abstract.Using the AdS/CFT correspondence, we study the heavy quark potential and the jet quenching parameter in the near horizon limit of the D3-D

Holographic Schwinger Effect in a Confining D3-Brane Background with Chemical Potential

(-1)

Heavy quark potential from deformed AdS5 models

(-1) background. The results are compared with those of conformal cases. It is shown that the presence of instantons tends to suppress the heavy quark potential and enhance the jet quenching parameter.

Imaginary potential of moving quarkonia in a D-instanton background

Using the AdS/CFT correspondence, we investigate the Schwinger effect in a confining D3-brane background with chemical potential. The potential between a test particle pair on the D3-brane in an external electric field is obtained. The critical field

Imaginary potential in strongly coupled N=4 SYM plasma in a magnetic field

E_c

Drag force in a D-instanton background

in this case is calculated. Also, we apply numerical method to evaluate the production rate for various cases. The results imply that the presence of chemical potential tends to suppress the pair production effect.

Holographic Schwinger effect with a moving D3-brane

Abstract 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 AdS 5 case. It is shown that the obtained potential is negative definite for all quark–antiquark separations, differs from that using the usual renormalization scheme.

R2 corrections to holographic Schwinger effect

The imaginary part of the inter-quarks potential of moving heavy quarkonia is investigated in a dual supergravity of the AdS background deformed by dilaton, which induces the gauge field condensate in the dual gauge theory. We analyze the quark anti-quark pair moving transverse and parallel to the plasma wind, respectively. It is shown that for both cases the presence of D-instanton density tends to increase the inter-distance and decrease the imaginary potential, reverse to the effect of the pairs velocity. Moreover, it is found that the D-instanton density has stronger effects for the parallel case rather than transverse.