We explore a new paradigm to study dissipative dark matter models using gravitational-wave observations. We consider a dark atomic model which predicts the formation of binary black holes such as GW190425 while obeying constraints from large-scale structure, and improving on the missing satellite problem. Using LIGO and Virgo gravitational-wave data from 12th September 2015 to 1st October 2019, we show that interpreting GW190425 as a dark matter black-hole binary limits the Chandrasekhar mass for dark matter to be below 1.4 M⊙ at >99.9% confidence implying that the dark proton is heavier than 0.95 GeV, while also suggesting that the molecular energy-level spacing of dark molecules lies near 10−3 eV and constraining the cooling rate of dark matter at low temperatures.
@article{arxiv.2009.05209,
title = {A gravitational-wave limit on the Chandrasekhar mass of dark matter},
author = {Divya Singh and Michael Ryan and Ryan Magee and Towsifa Akhter and Sarah Shandera and Donghui Jeong and Chad Hanna},
journal= {arXiv preprint arXiv:2009.05209},
year = {2021}
}