Publication: Study of gamma ray signals from primordial black hole evaporation
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Date
2022-11
Authors
Recabarren Vergara, Luis Matías
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Abstract
In this work, we study the photon spectrum produced by the Hawking radiation from
a primordial black hole (PBH). We focus on the last stages before full evaporation. The
spectrum is estimated using the black body approach and Hawking’s emission formula. The
connection between both descriptions is discussed. Furthermore, through analytical approximations
for the greybody factors at the high and low energy limits, we time-integrate the
primary spectrum along the PBH lifetime. As a result, we obtain a correction to the primary
photon time-integrated spectrum commonly used in the literature. In addition, due to the
BH emission of free quarks, we estimate, under rough approximations, the pion production
from quark hadronization. As a consequence, a secondary photon spectrum is obtained
through π0 → γγ decay. These calculations for the spectral emission are compared with
spectra obtained with simulations using BlackHawk. Based on the previous analysis, we
estimate the number of photons per km2, within a certain detection energy interval, and
during a fixed observation time, that eventually reach the Earth’s atmosphere. Finally, with
the help of Corsika, we run simulations of very high energy gamma rays to study the basic
features of the electromagnetic showers that are produced in the atmosphere.
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Keywords
GAMMA RAYS , PRIMORDIAL BLACK HOLES , HAWKING RADIATION