Second-order Chapman-Enskog viscous corrections suppress heavy-quark drag, induce nontrivial transverse diffusion, and boost early-time dilepton yields relative to first-order or Grad corrections, with the size of the effect set by the interplay between correction momentum dependence and observable
Thermal photons in QGP and non-ideal effects
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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 \textit{non-ideal} gas equation of state i.e $\epsilon-3\,P\,\neq 0$ 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 \textit{non-ideal} gas equation of state. We also analyze the interesting phenomenon of bulk viscosity induced cavitation making the hydrodynamical description invalid. We include the viscous corrections to the distribution functions while calculating the photon spectra. It is shown that ignoring the cavitation phenomenon can lead to erroneous estimation of the photon flux.
years
2026 2verdicts
UNVERDICTED 2representative citing papers
Models chemical non-equilibrium in finite-density QGP under conformal Gubser flow and its impact on hard thermal photon production, finding delayed equilibration with quarks lagging gluons, suppressed total yield but enhanced early high-pT photons, and distinct temporal emission structure.
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Observable Dependence of Viscous Corrections in QGP: Heavy Quarks and Dileptons in Chapman--Enskog Theory
Second-order Chapman-Enskog viscous corrections suppress heavy-quark drag, induce nontrivial transverse diffusion, and boost early-time dilepton yields relative to first-order or Grad corrections, with the size of the effect set by the interplay between correction momentum dependence and observable
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Finite-Density Dynamics of Chemically Equilibrating QGP in Conformal Gubser Flow and Hard Thermal Photon Production
Models chemical non-equilibrium in finite-density QGP under conformal Gubser flow and its impact on hard thermal photon production, finding delayed equilibration with quarks lagging gluons, suppressed total yield but enhanced early high-pT photons, and distinct temporal emission structure.