Thermal photons in QGP and non-ideal effect

被引：27
作者：
Bhatt, Jitesh R. [1 ]
Mishra, Hiranmaya [1 ]
Sreekanth, V. [1 ]
机构：
[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2010年 / 11期
关键词：
Hadronic Colliders; QCD; QUARK-GLUON PLASMA; NUCLEUS-NUCLEUS COLLISIONS; HARD PHOTON; THERMODYNAMICS; EMISSION; QCD;
D O I：
10.1007/JHEP11(2010)106
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
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 epsilon-3 P not equal 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.
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页数：22
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