Routing protocol

Stellar black hole

Optics

Physics

Astronomy

Galactic Center

Mass distribution

Dark matter

Composite material

Primordial black hole

Intermediate-mass black hole

Gravitational wave

Materials science

Range (aeronautics)

Computer network

Binary black hole

Monochromatic color

Computer science

Astrophysics

Black hole (networking)

Routing (electronic design automation)

Link-state routing protocol

Galaxy

Physical review. D/Physical review. D.

Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultralight, asteroid-mass PBHs with masses around ${10}^{17}\text{ }\text{ }\mathrm{g}$ are particularly interesting as current observations allow them to constitute the entire DM density. PBHs in this mass range emit $\ensuremath{\sim}\mathrm{MeV}$ photons via Hawking radiation which can directly be detected by the gamma ray telescopes, such as the upcoming AMEGO. In this work we forecast how well an instrument with the sensitivity of AMEGO will be able to detect, or rule out, PBHs as a DM candidate, by searching for their evaporating signature when marginalizing over the Galactic and extra-Galactic gamma-ray backgrounds. We find that an instrument with the sensitivity of AMEGO could exclude nonrotating PBHs as the only DM component for masses up to $7\ifmmode\times\else\texttimes\fi{}{10}^{17}\text{ }\text{ }\mathrm{g}$ at 95% confidence level for a monochromatic mass distribution, improving upon current bounds by nearly an order of magnitude. The forecasted constraints are more stringent for PBHs that have rotation, or which follow extended mass distributions.

Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter