%0 Generic %1 wang2019universality %A Wang, Jie %A Bose, Sownak %A Frenk, Carlos S. %A Gao, Liang %A Jenkins, Adrian %A Springel, Volker %A White, Simon D. M. %D 2019 %K Dark matter only simulation %T Universality in the structure of dark matter haloes over twenty orders of magnitude in halo mass %U http://arxiv.org/abs/1911.09720 %X Dark matter haloes are the basic units of all cosmic structure. They grew by gravitational amplification of weak initial density fluctuations that are still visible on large scales in the cosmic microwave background radiation. Galaxies formed within relatively massive haloes as gas cooled and condensed at their centres, but many hypotheses for the nature of dark matter imply that the halo population should extend to masses many orders of magnitude below those where galaxies can form. Here, we use a novel, multi-zoom technique to create the first consistent simulation of the formation of present-day haloes over the full mass range populated when dark matter is aWeakly Interacting Massive Particle (WIMP) of mass ~100 GeV. The simulation has a dynamic range of 30 orders of magnitude in mass, resolving the internal structure of hundreds of Earth-mass haloes just as well as that of hundreds of rich galaxy clusters. Remarkably, halo density profiles are universal over the entire mass range and are well described by simple two-parameter fitting formulae. Halo mass and concentration are tightly related in a way which depends on cosmology and on the nature of the dark matter. At fixed mass, concentration is independent of local environment for haloes less massive than those of typical galaxies. These results are important for predicting annihilation radiation signals from dark matter, since these should be dominated by contributions from the smallest structures.

@misc{wang2019universality, abstract = {Dark matter haloes are the basic units of all cosmic structure. They grew by gravitational amplification of weak initial density fluctuations that are still visible on large scales in the cosmic microwave background radiation. Galaxies formed within relatively massive haloes as gas cooled and condensed at their centres, but many hypotheses for the nature of dark matter imply that the halo population should extend to masses many orders of magnitude below those where galaxies can form. Here, we use a novel, multi-zoom technique to create the first consistent simulation of the formation of present-day haloes over the full mass range populated when dark matter is aWeakly Interacting Massive Particle (WIMP) of mass ~100 GeV. The simulation has a dynamic range of 30 orders of magnitude in mass, resolving the internal structure of hundreds of Earth-mass haloes just as well as that of hundreds of rich galaxy clusters. Remarkably, halo density profiles are universal over the entire mass range and are well described by simple two-parameter fitting formulae. Halo mass and concentration are tightly related in a way which depends on cosmology and on the nature of the dark matter. At fixed mass, concentration is independent of local environment for haloes less massive than those of typical galaxies. These results are important for predicting annihilation radiation signals from dark matter, since these should be dominated by contributions from the smallest structures.}, added-at = {2019-11-26T13:48:15.000+0100}, author = {Wang, Jie and Bose, Sownak and Frenk, Carlos S. and Gao, Liang and Jenkins, Adrian and Springel, Volker and White, Simon D. M.}, biburl = {https://www.bibsonomy.org/bibtex/2e0c108a287b637a569aec9f6422af948/rana_7690}, description = {1911.09720.pdf}, interhash = {cee65e0d379a99d3a402bc3af7c24c1d}, intrahash = {e0c108a287b637a569aec9f6422af948}, keywords = {Dark matter only simulation}, note = {cite arxiv:1911.09720Comment: 35 pages, 8 figures, submitted}, timestamp = {2019-11-26T13:48:21.000+0100}, title = {Universality in the structure of dark matter haloes over twenty orders of magnitude in halo mass}, url = {http://arxiv.org/abs/1911.09720}, year = 2019 }