%0 Generic %1 shimabukuro2022impact %A Shimabukuro, Hayato %A Ichiki, Kiyotomo %A Kadota, Kenji %D 2022 %K library %T The impact of dark matter-baryon relative velocity on the 21cm forest %U http://arxiv.org/abs/2212.08409 %X We study the effect of the relative velocity between the dark matter (DM) and the baryon on the 21cm forest signals. The DM-baryon relative velocity arises due to their different evolutions before the baryon-photon decoupling epoch and it gives an additional anisotropic pressure that can suppress the perturbation growth. It is intriguing that the scales $kO(10\sim 10^3)h/Mpc$ at which the matter power spectrum is affected by such a streaming velocity turns out to be the scale at which the 21cm forest signal is sensitive to. We demonstrate that the 21cm absorption line abundance can decrease by more than a factor of a few due to the small-scale matter power spectrum suppression caused by the DM-baryon relative velocity.

@misc{shimabukuro2022impact, abstract = {We study the effect of the relative velocity between the dark matter (DM) and the baryon on the 21cm forest signals. The DM-baryon relative velocity arises due to their different evolutions before the baryon-photon decoupling epoch and it gives an additional anisotropic pressure that can suppress the perturbation growth. It is intriguing that the scales $k\sim {\cal O}(10\sim 10^3)h/\mathrm{Mpc}$ at which the matter power spectrum is affected by such a streaming velocity turns out to be the scale at which the 21cm forest signal is sensitive to. We demonstrate that the 21cm absorption line abundance can decrease by more than a factor of a few due to the small-scale matter power spectrum suppression caused by the DM-baryon relative velocity.}, added-at = {2022-12-19T09:32:24.000+0100}, author = {Shimabukuro, Hayato and Ichiki, Kiyotomo and Kadota, Kenji}, biburl = {https://www.bibsonomy.org/bibtex/2ab9a82edb578b8437ce418785a24193f/gpkulkarni}, description = {The impact of dark matter-baryon relative velocity on the 21cm forest}, interhash = {c94fedb25d3391f29bd7dc8a697b53f4}, intrahash = {ab9a82edb578b8437ce418785a24193f}, keywords = {library}, note = {cite arxiv:2212.08409Comment: 8pages, 5 figures}, timestamp = {2022-12-19T09:32:24.000+0100}, title = {The impact of dark matter-baryon relative velocity on the 21cm forest}, url = {http://arxiv.org/abs/2212.08409}, year = 2022 }