Probing sub-GeV dark matter-baryon scattering with cosmological observables

被引：150

作者：

Xu, Weishuang Linda ^{[1
]}

Dvorkin, Cora ^{[1
]}

Chael, Andrew ^{[1
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 10期

关键词：

MILLICHARGED PARTICLES; LAMBDA-CDM; MILKY-WAY; CONSTRAINTS; LIMITS;

D O I：

10.1103/PhysRevD.97.103530

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We derive new limits on the elastic scattering cross section between baryons and dark matter using cosmic microwave background data from the Planck satellite and measurements of the Lyman-alpha forest flux power spectrum from the Sloan Digital Sky Survey. Our analysis addresses generic cross sections of the form sigma proportional to v(n), where v is the dark matter-baryon relative velocity, allowing for constraints on the cross section independent of specific particle physics models. We include high-l polarization data from Planck in our analysis, improving over previous constraints. We apply a more careful treatment of dark matter thermal evolution than previously done, allowing us to extend our constraints down to dark matter masses of similar to MeV. We show in this work that cosmological probes are complementary to current direct detection and astrophysical searches.

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