Modeling evolution of dark matter substructure and annihilation boost
Modeling evolution of dark matter substructure and annihilation boost
复制标题
模拟暗物质子结构的演化和湮灭增强
DOI：
10.1103/physrevd.97.123002
复制
发表时间：
2018
影响因子：
5
通讯作者：
Ishiyama Tomoaki
中科院分区：
文献类型：
--
作者：
Hiroshima Nagisa;Ando Shin’ichiro;Ishiyama Tomoaki
我们研究了暗物质子结构的演化，特别是它们在落入较大宿主晕的引力势后如何失去质量和改变密度分布。我们开发了一个分析处方，模型的subhalo质量的演变和校准的各种尺度的体数值模拟的结果，从非常小的（地球大小）到大（星系团）晕。然后，我们结合联合收割机的结果与晕吸积的历史和计算的subhalo质量函数，是物理动机下降到地球质量尺度。我们的结果有效的任意主机质量和红移有合理的协议，在解决尺度的数值模拟。我们的分析模型还能够自洽计算暗物质湮灭的助推因子，我们发现从最小（地球）和中间（矮星）质量的百分之几十增加到星系大小的几个因子，并在小红移时成为最大光环（集群）的一个因子。我们的分析方法可以容纳子结构的subhalos（子subhalos）在一个一致的框架，我们发现放弃了几个增强的湮灭助推的一个因素。暗晕的存在增强了各向同性伽马射线背景的强度，其结果是，费米大面积望远镜的测量排除了大于的暗物质质量的湮灭截面。
We study evolution of dark matter substructures, especially how they lose mass and change density profile after they fall in gravitational potential of larger host halos. We develop an analytical prescription that models the subhalo mass evolution and calibrate it to results of-body numerical simulations of various scales from very small (Earth size) to large (galaxies to clusters) halos. We then combine the results with halo accretion histories and calculate the subhalo mass function that is physically motivated down to Earth-mass scales. Our results—valid for arbitrary host masses and redshifts—have reasonable agreement with those of numerical simulations at resolved scales. Our analytical model also enables self-consistent calculations of the boost factor of dark matter annihilation, which we find to increase from tens of percent at the smallest (Earth) and intermediate (dwarfs) masses to a factor of several at galaxy size, and to become as large as a factor offor the largest halos (clusters) at small redshifts. Our analytical approach can accommodate substructures in the subhalos (sub-subhalos) in a consistent framework, which we find to give up to a factor of a few enhancements to the annihilation boost. The presence of the subhalos enhances the intensity of the isotropic gamma-ray background by a factor of a few, and as the result, the measurement by the Fermi Large Area Telescope excludes the annihilation cross section greater thanfor dark matter masses up to.
登录
查看更多内容
DOI：
10.1111/j.1365-2966.2005.09633.x
发表时间：
2004
影响因子：
4.8
作者：
J. Peñarrubia;Andrew J Benson
通讯作者：
Andrew J Benson
DOI：
10.1111/j.1365-2966.2009.15034.x
发表时间：
2008-08
影响因子：
4.8
作者：
K. Dolag;S. Borgani;S. Borgani;S. Borgani;G. Murante;V. Springel
通讯作者：
K. Dolag;S. Borgani;S. Borgani;S. Borgani;G. Murante;V. Springel
影响因子：
4.9
作者：
Ackermann, M.;Ajello, M.;Zimmer, S.
通讯作者：
Zimmer, S.
影响因子：
5
作者：
S. Ando
通讯作者：
S. Ando
影响因子：
5
作者：
S. Ando;E. Komatsu;Takuro Narumoto;T. Totani
通讯作者：
S. Ando;E. Komatsu;Takuro Narumoto;T. Totani