We study the response functions (chromo-electric susceptibilities) for an interacting quark-gluon plasma. The interaction effects have been encoded in the effective fugacities for quasi-partons which are extracted self-consistently from the two equations of state for hot QCD. The first one is the fully perturbative O(g 5 ) EOS and, the second one which is O(g 6 ln(1/g)), incorporates some non-perturbative effects.We find that response function shows large deviations from the ideal behavior. We further determine the temperature dependence of the Debye mass by fixing the effective coupling constant Q 2 which appears in the transport equation. We show that our formalism naturally yields the leading order HTL expression for the Debye mass if we employ the ideal EOS. Employing the Debye mass, we estimate the dissociation temperatures for various charmonium and bottomonium bound states. These results are consistent with the current theoretical studies. PACS

The effect of quark mass on the Regge trajectory is analysed. Modifications in the equations of Regge trajectories are shown for mesonic as well as baryonic systems. For mesonic systems, the Regge trajectories get modified, but still remain linear. Contrary to the mesonic case, the Regge trajectories for baryonic systems indicate non-linearity. It is shown that in low mass and angular momentum region two hadrons with different quark compositions can have same mass and angular momentum.

We have investigated the Regge trajectories of exotic hadrons by considering different possible pentaquark configurations with finite quark mass in the flux tube model. Significant deviation is observed in the linear behavior of the Regge trajectories for pentaquark systems in view of the universal value of the Regge slope parameter for hadrons. The modified Regge trajectories are also compared with the available experimental and lattice data. It is observed that the non-linear Regge trajectories of such pentaqurk systems can be well described by the relativistic corrections in view of the current quark masses and the high rotational speed of the quarks at the end of flux tube structure.

Quarks are color charged particles. Due to their motion there is a strong possibility of generation of color magnetic field. It is shown that however hadrons are color singlet particles they may have non-zero color magnetic moment. Due to this color magnetic moment hadrons can show color interaction. In this paper we have studied the chromomagnetic properties of nuclear matter.

No abstract

Have you ever wondered why Osama Bin Laden has not been arrested and killed so far? Not even by the all powerful American Army! JoAnn Jaffe, one of the co-editors of Contesting Fundamentalisms, argues, the public stage has been monopolised by the symbiotic conflict between two great fundamentalisms. The right-wing Christian United States President George Bush and the leader of the Islamic Al Qu'eda movement, Saudi Arabian Osama Bin Laden, have been each other's best friends, the later, in fact, through his activities helping President Bush to pursue American imperialism. In order to be both 'exclusive' and 'universal', the fundamentalist identity, often leads to a type of nationalism where religion and nation coincide as it happened in the case of the United States of America.

No abstract

No abstract