Production of thermal photons in a simple chiral-hydrodynamic model

Abstract

We use a self-consistent chiral-hydrodynamic formalism which combines the linear $\sigma$ model with second-order hydrodynamics in 2+1 dimensions to compute the spectrum of thermal photons produced in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. The temperature-dependent shear viscosity of the model, $\eta$, is calculated from the linearized Boltzmann equation. We compare the results obtained in the chiral-hydrodynamic model to those obtained in the second-order theory with a Lattice QCD equation of state and a temperature-independent value of $\eta /s$. We find that the thermal photon production is significantly larger in the latter model due to a slower evolution and larger dissipative effects.

5 pages, 2 figures. To appear in Int. J. Mod. Phys.: Conference Series, Proceedings of IWARA 2011

References in corpus (3)

• Dissipative hydrodynamics coupled to chiral fields
• Thermal photon production in Au+Au collisions: viscous corrections in two different hydrodynamic formalisms
• Production of thermal photons in viscous fluid dynamics with temperature-dependent shear viscosity