%0 Generic %1 safarzadeh2021challenge %A Safarzadeh, Mohammadtaher %A Loeb, Abraham %D 2021 %K library %T A New Challenge for Dark Matter Models %U http://arxiv.org/abs/2107.03478 %X Cold dark matter (CDM) has faced a number of challenges mainly at small scales, such as the too-big-to-fail problem, and core-cusp density profile of dwarf galaxies. Such problems were argued to have a solution either in the baryonic physics sector or in modifying the nature of dark matter to be self-interacting, or self-annihilating, or ultra-light. Here we present a new challenge for CDM by showing that some of Milky Way's satellites are too dense, requiring the formation masses and redshifts of halos in CDM not compatible with being a satellite. These too-dense-to-be-satellite systems are dominated by dark matter and exhibit a surface density above mean dark matter cosmic surface density $\simØmega_dm \rho_c c/H_0200~M_ødot/pc^2$. This value corresponds to dark matter pressure of $10^-10\rm erg/cm^3$. This problem, unlike other issues facing CDM, has no solution in the baryonic sector and none of the current alternatives of dark matter can account for it. The too-dense-to-be-satellite problem presented in this work provides a new clue for the nature of dark matter, never accounted for before.

@misc{safarzadeh2021challenge, abstract = {Cold dark matter (CDM) has faced a number of challenges mainly at small scales, such as the too-big-to-fail problem, and core-cusp density profile of dwarf galaxies. Such problems were argued to have a solution either in the baryonic physics sector or in modifying the nature of dark matter to be self-interacting, or self-annihilating, or ultra-light. Here we present a new challenge for CDM by showing that some of Milky Way's satellites are too dense, requiring the formation masses and redshifts of halos in CDM not compatible with being a satellite. These too-dense-to-be-satellite systems are dominated by dark matter and exhibit a surface density above mean dark matter cosmic surface density $\sim\Omega_{dm} \rho_c c/H_0\approx 200~\rm M_{\odot}/pc^2$. This value corresponds to dark matter pressure of $\approx 10^{-10}{\rm erg/cm^3}$. This problem, unlike other issues facing CDM, has no solution in the baryonic sector and none of the current alternatives of dark matter can account for it. The too-dense-to-be-satellite problem presented in this work provides a new clue for the nature of dark matter, never accounted for before.}, added-at = {2021-07-09T10:54:35.000+0200}, author = {Safarzadeh, Mohammadtaher and Loeb, Abraham}, biburl = {https://www.bibsonomy.org/bibtex/238049a3f2266de64506e892c8f07bb85/gpkulkarni}, description = {A New Challenge for Dark Matter Models}, interhash = {48e3aea38df31c480488596340991c6d}, intrahash = {38049a3f2266de64506e892c8f07bb85}, keywords = {library}, note = {cite arxiv:2107.03478Comment: submitted to PRL, Comments are welcome}, timestamp = {2021-07-09T10:54:35.000+0200}, title = {A New Challenge for Dark Matter Models}, url = {http://arxiv.org/abs/2107.03478}, year = 2021 }