Relaxation of baryon diffusion flow in QGP medium and its impact on thermal photon spectra

Abstract

In the current work the time evolution of baryon diffusion flow within the scope of second order relativistic hydrodynamic theory has been studied for a 2-component quark-gluon system. The relaxation time for diffusion flow is estimated using the Grad's moment method of many particle kinetic theory. The temperature dependence of relaxation time for diffusion flow has been obtained for different quark chemical potentials. Finally, the diffusion equation has been solved for a $1+1$ dimensional boost invariant system and the effect of diffusion flow has been studied on the thermal photon spectra in a baryon rich environment. The present analysis on the role of baryon number diffusion in influencing the properties of hot QCD medium could be relevant for the baryon rich matter explorations in upcoming experimental facilities.