Chemical equilibration in viscous quark-gluon plasma and electromagnetic signals

Abstract

We investigate the chemical equilibration of the parton distributions in collisions of two heavy nuclei, assuming the partonic fluid to be ideal as well as viscous. The initial conditions are taken from HIJING calculations for Au+Au collisions at RHIC and LHC energies. It was seen that when the viscous drag is taken into account in the fluid flow, the life time of the plasma is increased by nearly a factor of 2. The temperature as well as fugacities evolve slowly than their ideal counterpart. The photon and lepton pair production was also investigated. There is a two fold increase in the photon and lepton pair numbers with viscosity on. The increase in the large $p_T$ photons and the large invariant mass lepton pairs are due to slower rate of temperature evolution.

14 pages, including figures

References in corpus (4)

• Expanding Quark-Gluon Plasmas: Transverse Flow, Chemical Equilibration and Electromagnetic Radiation
• Screening of initial parton production in ultrarelativistic heavy-ion collisions
• Thermal and chemical equilibration in a gluon plasma
• Chemical Equilibration of an Expanding Quark-Gluon Plasma

Cited by in corpus (7)

• Causal Theories of Dissipative Relativistic Fluid Dynamics for Nuclear Collisions
• Multi-messenger heavy-ion collision physics
• Dissipative hydrodynamics in 2+1 dimension
• Hydrodynamical evolution of dissipative QGP fluid
• Photon emission from out of equilibrium dissipative parton plasma
• Viscous hydrodynamics
• Enhancement of gluonic dissociation of $J/\psi$ in viscous QGP