Constraining primordial black holes as dark matter at JUNO
Sai Wang, Dong-Mei Xia, Xukun Zhang, Shun Zhou, Zhe Chang

TL;DR
This paper explores how the JUNO neutrino detector can constrain primordial black holes as dark matter by detecting neutrino signals from Hawking radiation, significantly improving current limits especially for lighter PBHs.
Contribution
It demonstrates the potential of JUNO to set new, tighter bounds on PBH dark matter fraction using neutrino detection, particularly via inverse beta decay channel.
Findings
JUNO can improve bounds on PBH dark matter fraction by a factor of 20 for 10^{15} g PBHs.
The inverse beta decay channel is most sensitive for detecting PBH Hawking radiation.
Constraints weaken for heavier PBHs with lower Hawking temperatures.
Abstract
As an attractive candidate for dark matter, the primordial black holes (PBHs) in the mass range () could be detected via their Hawking radiation, including neutrinos and antineutrinos of three flavors. In this paper, we investigate the possibility to constrain the PBH as dark matter by measuring (anti)neutrino signals at the large liquid-scintillator detector of Jiangmen Underground Neutrino Observatory (JUNO). Among six available detection channels, the inverse beta decay is shown to be most sensitive to the fraction of PBHs contributing to the dark matter abundance. Given the PBH mass , we find that JUNO will be able to place an upper bound , which is 20 times better than the current best limit $f^{}_{\rm PBH} \lesssim…
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