Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..558..850b&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: International Symposium. AIP Conference Proceedings, Volume 558, pp. 850-853 (2001).
Astronomy and Astrophysics
Astronomy
Radiation Mechanisms, Polarization
Scientific paper
Universal observational feature of microscopic primordial black holes is the Hawking emission which is believed to occur in the regime of noninteracting quark-gluon jets and their products. Then, stringent upper limit on the number density of primordial black holes seems to rule out the possibility of their discovery in the near future. Contrary to this widely accepted opinion, we show that, when the black-hole temperature exceeds 10 GeV, the charged particle outflow from a black hole becomes plasma and the magnetohydrodynamical regime of expansion can be realized. In this case, the kinetic energy of ejected particles can be converted into the 0.1-1 MeV γ-rays due to the synchrotron radiation and electromagnetic cascade in the close-to-equipartition turbulent magnetic field. Also, the cascade leads to the significant increase of photon flux in the sub-GeV range. As a result, a black hole with mass below 1012 g becomes a transient γ-ray source with luminosity growing according to the explosive-type law. We show that up to several per cent of the gamma-ray bursts detected by BATSE can be associated with evaporating black holes with temperature exceeding ~1 TeV and masses below 1010 g, located at distances within ~1 pc from the Earth. .
Belyanin Alexey
Kocharovsky Vitaly V.
Kocharovsky Vl. V.
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