Light in the Shadows: Primordial Black Holes Making Dark Matter Shine
Kaustubh Agashe, Manuel Buen-Abad, Jae Hyeok Chang, Steven J. Clark,, Bhaskar Dutta, Yuhsin Tsai, and Tao Xu

TL;DR
This paper explores how primordial black holes emitting Hawking radiation can activate dormant dark matter, leading to potential observable signals in gamma-ray experiments, thus providing a novel indirect detection method for dark sector physics.
Contribution
It introduces a new mechanism where PBHs catalyze dark matter interactions, enabling indirect detection signals that were previously suppressed or undetectable.
Findings
PBHs can radiate dark sector particles, activating dormant dark matter.
Resurrected signals from asymmetric dark matter via PBH-induced anti-DM emission.
Potential gamma-ray signals detectable by AMEGO-X from asteroid-mass PBHs.
Abstract
We consider the possibility of indirect detection of dark sector processes by investigating a novel form of interaction between ambient dark matter (DM) and primordial black holes (PBHs). The basic scenario we envisage is that the ambient DM is ``dormant'', \ie, it has interactions with the SM, but its potential for an associated SM signal is not realized for various reasons. We argue that the presence of PBHs with active Hawking radiation (independent of any DM considerations) can act as a catalyst in this regard by overcoming the aforementioned bottlenecks. The central point is that PBHs radiate all types of particles, whether in the standard model (SM) or beyond (BSM), which have a mass at or below their Hawking temperature. The emission of such radiation is ``democratic" (up to the particle spin), since it is based on a coupling of sorts of gravitational origin. In particular, such…
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