Correlating Gravitational Wave and Gamma-ray Signals from Primordial Black Holes

Understand

Asteroid-mass primordial black holes (PBH) can explain the observed dark matter abundance while being consistent with the current indirect detection constraints.

• These PBH can produce gamma-ray signals from Hawking radiation that are within the sensitivity of future measurements by the AMEGO and e-ASTROGAM experiments.
• PBH which give rise to such observable gamma-ray signals have a cosmic origin from large primordial curvature fluctuations.
• There must then be a companion, stochastic gravitational wave (GW) background produced by the same curvature fluctuations.