Searching for Primordial Black Hole as Dark matter by cross-correlation with MeV $\gamma$-ray emissions
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July 25, 2023
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Abstract
Primordial black holes (PBHs) as potential candidates for dark matter have recently regained wide attention. We focus on the Hawking radiation of PBHs, utilizing the cross-correlation between MeV $\gamma$-ray emissions and the lensing effect of the cosmic microwave background (CMB). Near-future data can provide tight constraints on the fraction of Schwarzschild PBHs with masses around $10^{17}$ g, we consider the CMB-S4 project and the $\gamma$-ray telescope e-ASTROGAM for this purpose. Additionally, we consider the conservative astrophysical model as a reference for the observed emissions in the MeV energy range. Moreover, we can enhance our constraining capability by an order of magnitude when taking the PBHs model with spins into account. This technology, coupled with appropriate data, bears significance in bridging the gaps in determining PBHs fraction limits within the asteroid mass range.
DOI: https://doi.org/10.22323/1.444.1364
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.