New gamma-ray spectrum from a quark-gluon plasma photosphere around an evaporating primordial black hole.

Details New gamma-ray spectrum from a quark-gluon plasma photosphere around an evaporating primordial black hole. New gamma-ray spectrum from a quark-gluon plasma photosphere around an evaporating primordial black hole.

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jkps...34..176h&link_type=abstract

Journal of the Korean Physical Society, Vol. 34, No. 2, p. 176 - 180

Other

Black Holes: Evaporation, Black Holes: Gamma-Ray Spectra

Scientific paper

It has been shown that once the surface temperature of a primordial black hole (PBH) surpasses ΛQCD ≍ 200 MeV, the quarks and the gluons emitted through Hawking radiation interact with one another via quantum chromodynamics (QCD) bremsstrahlung and pair production. They form a nearly thermal quark-gluon plasma (QGP) photosphere, which subsequently expands outward. As a consequence, the quarks and the gluons in the photosphere scatter and dramatically lose energy as they propagate away from the PBH. The emergent γ-ray spectrum intensity from π0→2γ, which occurs when the quarks and the gluons fragment into hadrons at the outer QGP photosphere, peaks at about Eγ ≍ 100 MeV, but the intensity is higher than that of the previous published QCD calculation. The authors calculate the spectrum of the γ-rays which emerge directly from inside of the QGP photosphere and which are due to the quark-antiquark annihilation and the QCD Compton processes. The authors find for Tpbh > ΛQCD that the peak intensity and the peak energy of the new spectrum increase by emitting more particles as the PBH temperature becomes hotter.

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