Speaker
Description
Primordial black holes (PBHs) as a dark matter (DM) candidate become popular again recently. Through their Hawking radiation, we can analysis their signal by $\gamma$-ray emissions. Our work focuses on cross-correlating the MeV $\gamma$-ray emissions and the cosmic microwave background shear to constrain the fraction of PBHs as DM. Near-future data can provide a tight constraint on the fraction of the Schwarzschild PBHs in the mass range around $10^{17}$g, like CMB-S4 project and the $\gamma$-ray telescope e-ASTROGAM. Some astrophysical sources also contributed to the observed emission in the MeV energy band. Furthermore, the constraining ability can be improved by another order of magnitude when taking the PBHs model with spins into account. This technology with proper coming data could importantly fill the gaps with PBHs fraction limits in the asteroid mass range.
| Submitted on behalf of a Collaboration? | No |
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