Publication

Abstract : Relativistic hydrodynamics has been applied successfully to describe the dynamics of Quark Gluon Plasma (QGP) created in high energy nucleus-nucleus collisions. The causal description of this matter, with extreme low value of viscosity (η/s) has generated a lot of interest and has led to the development of various dissipative hydrodynamic theories. In the present work, we intend to study an important feature of boost invariant causal dissipative hydrodynamics - 'hydrodynamic attractor' through thermal particle production. We consider the recently obtained analytical solutions of higher-order causal viscous hydrodynamic theories under longitudinal boost invariance to study thermal particle spectra from QGP. Thermal dileptons and photons, which are emitted during the entire evolution of QGP, contain information about different stages of evolution and hence can be considered as most useful tool to study the hydrodynamic attractor. We calculate the dilepton and photon yields in the presence of Chapman-Enskog like viscous corrections to the distribution function and study the particle spectra under Bjorken expansion by employing the analytical solutions, including the attractor solution, of higher order viscous fluid dynamics