The Sensitivity Floor for Primordial Black Holes with Neutrino Searches
arxiv(2023)
摘要
Primordial black holes (PBHs) formed in the early Universe are well-motivated
dark matter (DM) candidates over a wide range of masses. These PBHs could emit
detectable signals in the form of photons, electrons, and neutrinos through
Hawking radiation. We consider the null observations of astrophysical
$\bar{\nu}_{e}$ flux from several neutrino detectors and set new constraints on
the PBHs as the dominant DM component to be above $6.4\times10^{15}\,{\rm g}$.
We also estimate the expected constraints with JUNO for the prospects in the
near future. Lastly, we note that the Diffuse Supernova Neutrino Background
(DSNB) is an unavoidable isotropic background. We thus estimate the sensitivity
floor for PBH parameter space due to DSNB, and show that it is difficult for
neutrino detectors to detect PBHs as 100% of DM above $9 \times 10^{15}\,{\rm
g}$.
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