%0 Generic %1 delos2022ultradense %A Delos, M. Sten %A Silk, Joseph %D 2022 %K library %T Ultradense dark matter haloes accompanying primordial black holes %U http://arxiv.org/abs/2210.04904 %X Primordial black holes (PBHs) form from large-amplitude initial density fluctuations and may comprise some or all of the dark matter. If PBHs have an extended mass spectrum, or in mixed PBH-particle dark matter scenarios, the extreme density fluctuations necessary to produce PBHs also lead to the formation of a much greater abundance of dark matter minihaloes with internal densities potentially of order $10^12$ M$_ødot$ pc$^-3$. We develop an analytic description of the formation of these ultradense haloes and use it to quantitatively compare PBH and halo distributions. PBHs that contribute only a per cent level fraction of the dark matter are accompanied by ultradense haloes that nevertheless comprise an order-unity fraction. This finding significantly alters the predictions of many PBH scenarios, enabling a variety of new observational tests.

@misc{delos2022ultradense, abstract = {Primordial black holes (PBHs) form from large-amplitude initial density fluctuations and may comprise some or all of the dark matter. If PBHs have an extended mass spectrum, or in mixed PBH-particle dark matter scenarios, the extreme density fluctuations necessary to produce PBHs also lead to the formation of a much greater abundance of dark matter minihaloes with internal densities potentially of order $10^{12}$ M$_\odot$ pc$^{-3}$. We develop an analytic description of the formation of these ultradense haloes and use it to quantitatively compare PBH and halo distributions. PBHs that contribute only a per cent level fraction of the dark matter are accompanied by ultradense haloes that nevertheless comprise an order-unity fraction. This finding significantly alters the predictions of many PBH scenarios, enabling a variety of new observational tests.}, added-at = {2022-10-12T09:35:52.000+0200}, author = {Delos, M. Sten and Silk, Joseph}, biburl = {https://www.bibsonomy.org/bibtex/2993edd25d0da795ddf8bfed65d1e4b7b/gpkulkarni}, description = {Ultradense dark matter haloes accompanying primordial black holes}, interhash = {ad54b73e3641bbcd5403a83527942380}, intrahash = {993edd25d0da795ddf8bfed65d1e4b7b}, keywords = {library}, note = {cite arxiv:2210.04904Comment: 5 pages, 3 figures}, timestamp = {2022-10-12T09:35:52.000+0200}, title = {Ultradense dark matter haloes accompanying primordial black holes}, url = {http://arxiv.org/abs/2210.04904}, year = 2022 }