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Thermal photons in QGP and non-ideal effects

Publication Type : Journal Article

Publisher : Journal of High Energy Physics

Source : Journal of High Energy Physics, Volume 2010, Number 11, p.106 (2010)

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Campus : Coimbatore

School : School of Engineering

Department : Sciences

Year : 2010

Abstract : We investigate the thermal photon production-rates using one dimensional boost-invariant second order relativistic hydrodynamics to find proper time evolution of the energy density and the temperature. The effect of bulk-viscosity and non-ideal equation of state are taken into account in a manner consistent with recent lattice QCD estimates. It is shown that the non-ideal gas equation of state i.e $ε$ − 3 P ≠ 0 behaviour of the expanding plasma, which is important near the phase-transition point, can significantly slow down the hydrodynamic expansion and thereby increase the photon production-rates. Inclusion of the bulk viscosity may also have similar effect on the hydrodynamic evolution. However the effect of bulk viscosity is shown to be significantly lower than the non-ideal gas equation of state. We also analyze the interesting phenomenon of bulk viscosity induced cavitation making the hydrodynamical description invalid. It is shown that ignoring the cavitation phenomenon can lead to erroneous estimation of the photon flux.

Cite this Research Publication : J. R. Bhatt, Mishra, H., and V. Sreekanth, “Thermal photons in QGP and non-ideal effects”, Journal of High Energy Physics, vol. 2010, p. 106, 2010.

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