Neutrino and positron constraints on spinning primordial black hole dark matter. (arXiv:1912.01014v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Dasgupta_B/0/1/0/all/0/1">Basudeb Dasgupta</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Laha_R/0/1/0/all/0/1">Ranjan Laha</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Ray_A/0/1/0/all/0/1">Anupam Ray</a>
Angular momentum is a fundamental property of a black hole and is known to
have a strong effect on its evaporation rate. It has recently been postulated
that primordial black holes can have substantial spin. We conduct a
comprehensive study of the detectability of primordial black holes with
non-negligible spin, via the searches for the diffuse supernova neutrino
background and observation of the 511 keV gamma-ray line from positrons in the
Galactic center, setting competitive constraints. Spinning primordial black
holes are probed up to a slightly higher mass range compared to non-spinning
ones. Our constraint using neutrinos is slightly weaker than that due to the
diffuse gamma-ray background. We find that the positron constraints are
typically weaker in the lower mass range and stronger in the higher mass range
for the spinning primordial black holes compared to the non-spinning ones. They
are generally stronger than those derived from the diffuse gamma-ray
measurements for primordial black holes having masses greater than a few
$times , 10^{16}$g.
Angular momentum is a fundamental property of a black hole and is known to
have a strong effect on its evaporation rate. It has recently been postulated
that primordial black holes can have substantial spin. We conduct a
comprehensive study of the detectability of primordial black holes with
non-negligible spin, via the searches for the diffuse supernova neutrino
background and observation of the 511 keV gamma-ray line from positrons in the
Galactic center, setting competitive constraints. Spinning primordial black
holes are probed up to a slightly higher mass range compared to non-spinning
ones. Our constraint using neutrinos is slightly weaker than that due to the
diffuse gamma-ray background. We find that the positron constraints are
typically weaker in the lower mass range and stronger in the higher mass range
for the spinning primordial black holes compared to the non-spinning ones. They
are generally stronger than those derived from the diffuse gamma-ray
measurements for primordial black holes having masses greater than a few
$times , 10^{16}$g.
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