Dark matter with topological defects in the Inert Doublet Model

被引：6

作者：

Hindmarsh, Mark ^{[1
,2
,3
]}

Kirk, Russell ^{[4
]}

No, Jose Miguel ^{[1
]}

West, Stephen M. ^{[4
]}

机构：

[1] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England

[2] Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland

[3] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[4] Royal Holloway Univ London, Dept Phys, Egham TW20 0EX, Surrey, England

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2015年 / 05期

基金：

英国科学技术设施理事会;

关键词：

dark matter theory; Cosmic strings; domain walls; monopoles; HIGH-ENERGY NEUTRINO; HIGGS-BOSON; NUCLEOSYNTHESIS; DECAY; LHC;

D O I：

10.1088/1475-7516/2015/05/048

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine the production of dark matter by decaying topological defects in the high mass region m(DM) >> m(W) of the Inert Doublet Model, extended with an extra U(1) gauge symmetry. The density of dark matter states (the neutral Higgs states of the inert doublet) is determined by the interplay of the freeze-out mechanism and the additional production of dark matter states from the decays of topological defects, in this case cosmic strings. These decays increase the predicted relic abundance compared to the standard freeze-out only case, and as a consequence the viable parameter space of the Inert Doublet Model can be widened substantially. In particular, for a given dark matter annihilation rate lower dark matter masses become viable. We investigate the allowed mass range taking into account constraints on the energy injection rate from the diffuse gamma-ray background and Big Bang Nucleosynthesis, together with constraints on the dark matter properties coming from direct and indirect detection limits. For the Inert Doublet Model high-mass region, an inert Higgs mass as low as similar to 200 GeV is permitted. There is also an upper limit on string mass per unit length, and hence the symmetry breaking scale, from the relic abundance in this scenario. Depending on assumptions made about the string decays, the limits are in the range 10(12) GeV to 10(13) GeV.

引用

页数：25

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