Can light dark matter solve the core-cusp problem?
Can light dark matter solve the core-cusp problem?
复制标题
光暗物质能解决核心尖点问题吗?
DOI:
10.1103/physrevd.98.023513
复制
发表时间:
2018
影响因子:
5
通讯作者:
Masoumi, Ali
中科院分区:
文献类型:
--
作者:
Deng, Heling;Hertzberg, Mark P.;Namjoo, Mohammad Hossein;Masoumi, Ali
Recently, there has been much interest in light dark matter, especially ultralight axions, as they may provide a solution to the core-cusp problem at the center of galaxies. Since very light bosons can have a de Broglie wavelength that is of astrophysical size, they can smooth out the centers of galaxies to produce a core, as opposed to vanilla dark matter models, and so it has been suggested that this solves the core-cusp problem. In this work, we critically examine this claim. While an ultralight particle will indeed lead to a core, we examine whether the relationship between the density of the core and its radius matches the data over a range of galaxies. We first review data that show the core density of a galaxyvaries as a function of the core radiusaswith. We then compare this to theoretical models. We examine a large class of light scalar dark matter models, governed by some potential. For simplicity, we take the scalar to be complex with a globalsymmetry in order to readily organize solutions by a conserved particle number. However, we expect our central conclusions to persist even for a real scalar, and furthermore, a complex scalar matches the behavior of a real scalar in the nonrelativistic limit which is the standard regime of interest. For any potential, we find the relationship betweenandfor ground state solutions is always in one of the following regimes: (i), or (ii), or (iii) unstable, and so it never matches the data. We also find similar conclusions for virialized dark matter, more general scalar field theories, degenerate fermion dark matter, superfluid dark matter, and general polytropes. We conclude that the solution to the core-cusp problem is more likely due to either complicated baryonic effects or some other type of dark matter interactions.
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影响因子:
5
作者:
M. H. Namjoo;A. Guth;D. Kaiser
通讯作者:
D. Kaiser
DOI:
10.1016/j.dark.2016.10.005
发表时间:
2016
期刊:
arXiv: High Energy Physics - Phenomenology
影响因子:
--
作者:
JiJi Fan
通讯作者:
JiJi Fan
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
M. Hertzberg
通讯作者:
M. Hertzberg
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
P. Sikivie;E. Todarello
通讯作者:
E. Todarello