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For as astrophysical black hole, the analogue temperature
is many orders of magnitude lower compared with the fluid temperature
of accreting matter. However, the study of analogue effects may be measurably
significant for accretion onto primordial black holes
because the analogue as well as the
actual Hawking temperature may be considerably high for such situations. There may be
a possibility that intense Hawking radiation may not allow any accretion due to the
domination of strong radiation pressure. However, the situation may be completely different
for Randall-Sundrum type II cosmology, where during the high energy regime of braneworld
cosmology, accretion may have significant effects on increasing the mass of the
primordial black holes. In braneworld scenario, the accretion onto the
primordial black holes from surrounding radiation bath may completely dominate over the
evaporation process as long as radiation dominations persists. We plan
to investigate
the analogue effects in primordial black hole accretion in Randall-Sundrum type - II
cosmology, to study whether analogue radiation can really dominate over the accretion phase,
resulting the enhancement of the black hole evaporation process.
We would also like to investigate whether the first `black hole explosions' due to
Hawking radiation would be acoustic-mediated explosions of the medium
surrounding the primordial black holes.
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Tapas Kumar Das
2009-01-17