Low Mass Black Holes from Dark Core Collapse

Unusual masses of the black holes being discovered by gravitational wave experiments pose fundamental questions about the origin of these black holes. More interestingly, black holes with masses smaller than the Chandrasekhar limit (~ 1.4 Mo) are essentially impossible to produce through any standard stellar evolution. Black holes of primordial origin, with fine tuned parameters and with no well-established formation mechanisms, are the most discussed explanation of these objects. The notable alternative proposals: the implosion of a compact object due to a tiny black hole transit or cumulative accumulation of self-interacting, asymmetric fermionic dark matter, are either ineffective or appeal to fairly baroque dark matter models. In this talk, I will discuss a simple production channel of sub Chandrasekhar mass black holes. Non-annihilating dark matter with non-zero interaction strength with stellar nuclei, a vanilla dark matter model, can naturally explain these low mass black holes. I will point out several avenues to test the origin of these low mass black holes, concentrating on the redshift dependence of the binary merger rate. I will show how redshift dependence of merger rate can be used by the future GW experiments to
determine the transmuted origin of low mass black holes.