%0 Generic %1 wadekar2019first %A Wadekar, Digvijay %A Farrar, Glennys R. %D 2019 %K tifr %T First direct astrophysical constraints on dark matter interactions with ordinary matter at very low velocities %U http://arxiv.org/abs/1903.12190 %X We derive the first direct constraints on dark matter cross sections at very low velocity, v $\approx$ 10 km/s, by requiring that the heating/cooling due to DM interacting with gas in the Leo T dwarf galaxy not exceed the radiative cooling rate of the gas. This gives strong direct limits on millicharged DM with mass $łesssim$ 1 GeV, which close important gaps in the exclusion plots and add to constraints on the recent EDGES 21 cm absorption anomaly. We also set new bounds on ultra-light dark photon DM and on DM-electron interactions. Combining equilibrium heating/cooling constraints from Leo T and robust Galactic gas clouds, we improve the constraints on DM-baryon cross-sections for arbitrary velocity dependences.

@misc{wadekar2019first, abstract = {We derive the first direct constraints on dark matter cross sections at very low velocity, v $\approx$ 10 km/s, by requiring that the heating/cooling due to DM interacting with gas in the Leo T dwarf galaxy not exceed the radiative cooling rate of the gas. This gives strong direct limits on millicharged DM with mass $\lesssim$ 1 GeV, which close important gaps in the exclusion plots and add to constraints on the recent EDGES 21 cm absorption anomaly. We also set new bounds on ultra-light dark photon DM and on DM-electron interactions. Combining equilibrium heating/cooling constraints from Leo T and robust Galactic gas clouds, we improve the constraints on DM-baryon cross-sections for arbitrary velocity dependences.}, added-at = {2019-04-01T08:29:40.000+0200}, author = {Wadekar, Digvijay and Farrar, Glennys R.}, biburl = {https://www.bibsonomy.org/bibtex/2367aa9b175205ef3f547189fb07b7f60/citekhatri}, description = {First direct astrophysical constraints on dark matter interactions with ordinary matter at very low velocities}, interhash = {cd5c6ea463c870a601068ab172951b80}, intrahash = {367aa9b175205ef3f547189fb07b7f60}, keywords = {tifr}, note = {cite arxiv:1903.12190Comment: 11 pages, 8 figures}, timestamp = {2019-04-04T10:22:23.000+0200}, title = {First direct astrophysical constraints on dark matter interactions with ordinary matter at very low velocities}, url = {http://arxiv.org/abs/1903.12190}, year = 2019 }