Biennial Report 2005-2007 - Saha Institute of Nuclear Physics

Theoretical Physics 151.4 Relativistic Heavy Ion Collisions, Quantum Chromodynamics,Hadrodynamics and Quark-Gluon Plasma1.4.1.1 Energy Loss of Charm Quarks in the Quark-Gluon Plasma: Collisional vsRadiativeConsidering the collisional energy loss rates of heavy quarks from hard light parton interactions thetotal energy loss of a charm quark for a static medium has been computed. For the energy range E ∼(5−10) GeV of charm quark, it is found to be almost same order as that of radiative ones estimatedto a first order opacity expansion. The collisional energy loss will become much more important forlower energy charm quarks and this feature could be very interesting for phenomenology of hadronsspectra.Munshi Golam MustafaTheo1.4.1.2 Dynamical Screening in a Quark-Gluon PlasmaWe calculate the wake potential of a fast parton moving through a quark gluon plasma usingthe framework of the Boltzmann-Vlasov equation. We found an anisotropic potential showing aminimum in the direction of the parton velocity. Possible consequences of this potential on binarystates in a quark-gluon plasma are discussed.Purnendu Chakraborty, Munshi Golam Mustafa, Markus H Thoma†Theo1.4.1.3 Some Applications of Thermal Field Theory to Quark-Gluon PlasmaIn this review we briefly introduce the thermal field theory within imaginary time formalism, thehard thermal loop perturbation theory and some of its applications to the physics of the quarkgluonplasma, possibly created in relativistic heavy-ion collisions.Munshi Golam MustafaTheo1.4.1.4 Susceptibilities and Speed of Sound from the Polyakov-Nambu-Jona-LasinioModelWe present the Taylor expansion coefficients of the pressure in quark number chemical potentialµ 0 = µ B /3 = µ u = µ d , for the strongly interacting matter as described by the PNJL model for twolight degenerate flavours of quarks u and d. The expansion has been done upto eighth order in µ 0 ,and the results are consistent with recent estimates from Lattice. We have further obtained thespecific heat C V , squared speed of sound v 2 s and the conformal measure ∆ C.Sanjay K Ghosh†, Tamal K Mukherjee†, Rajarshi Ray, Munshi G MustafaTheo