(NISER-TIFR discussion session) Utsab Gangopadhyay

Thursday 28 Nov 2019, 11:30 → 12:30 Asia/Kolkata

A 304

Title: Transport coefficients of a Hot Hadronic Matter\\ Abstract: The work deals with the study of transport properties of the later stage of a heavy ion collision, mainly after chemical freeze-out, from a kinetic theory approach. Transport coefficients that appear in second-order hydrodynamics for pion gas has been calculated using the relativistic form of the Grads 14-moment method. Instead of using the relativistic generalization developed by Israel-Stewart we have used Denicol- Neime-Molnar-Rischke theory. The transport coefficients like bulk viscosity, shear viscosity and thermal conductivity that goes in as input to calculate the relaxation time of flows that appear in the second-order hydrodynamic theory has been calculated using the Chapman-Enskog method. Transport coefficients in first-order hydrodynamics like shear viscosity, bulk viscosity, thermal conductivity, Dufour coefficient, thermal diffusion coefficient and diffusion coefficient for a mixture of pions and nucleons have been investigated, for a finite baryonic chemical potential. These cross-sections which appear in the collision integral is the dynamic input; through these cross-sections, the interaction between the constituent particles are introduced. But for a more realistic picture we have incorporated medium-effect in our cross-section, as the system we are studying presumably, is at a high temperature and density. The effect of a thermal medium is quantified through the self-energy of the propagators in ππ and πN collisions, which at finite temperature is evaluated using the real time formalism of thermal field theory