Cosmology of fermionic dark matter

Boeckel, Tillmann; Schaffner-Bielich, J.

doi:10.1103/physrevd.76.103509

Cited by 14 publications

(27 citation statements)

References 46 publications

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“…Also, the scattering cross-section off nucleon of a Majorana fermion is twice larger relative to a Dirac fermion. In many respects there is no significant difference between Dirac and Majorana fermion DM candidates though, as pointed out in previous works [12][13][14][15][16].…”

Section: Jhep09(2015)147supporting

confidence: 56%

Majorana dark matter through a narrow Higgs portal

Dutra

Pires

Silva

2015

J. High Energ. Phys.

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We update the parameter space of a singlet Majorana fermion dark matter model, in which the standard particles interact with the dark sector through the mixing of a singlet scalar and the Higgs boson. In this model both the dark matter and the singlet scalar carry lepton number, the latter being a bilepton. The stability of the Majorana fermion is achieved by a supposed Z 2 symmetry. The lepton number symmetry breaking scale, driven by the singlet scalar, is constrained to be within hundreds to thousands of GeV, so as to give a sufficiently abundant Majorana fermion. Relic density, direct detection and invisible Higgs decay are considered in a complementary way, as we contrast our parameter space with the Planck, LUX and LHC bounds. The impacts of the future Higgs self-coupling measurements and of XENON1T detector are also discussed. We find a "narrow" Higgs portal in the sense that large deviations from the standard scalar sector (large mixing and low lepton breaking scale) are very restricted by Higgs data global fit. We perform a systematic study of the allowed parameter space, favored by scalar resonances and degeneracy. One important phenomenological signature of this model is the correlation between the discoveries of a dark matter and a singlet scalar particles. Very light singlet scalars were found disfavored by direct detection, interestingly implying that the Majoron present in our spectrum can hardly be a dark radiation candidate if our scenario addresses the DM issue. This model is very predictive and in the next few years should be completely tested by the experiments.

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Section: Jhep09(2015)147supporting

confidence: 56%

Majorana dark matter through a narrow Higgs portal

Dutra

Pires

Silva

2015

J. High Energ. Phys.

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“…We argue in the following that this is a viable scenario for the QCD phase transition and not in contradiction to our present knowledge of QCD. Furthermore, we demonstrate that it would leave an observable imprint on the gravitational wave background [30].…”

Section: Early Universe: Phase Transition From Strange Quark Mattermentioning

confidence: 80%

Strangeness in astrophysics and cosmology

Boeckel

Hempel

Sagert

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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Abstract. Some recent developments concerning the role of strange quark matter for astrophysical systems and the QCD phase transition in the early universe are addressed. Causality constraints of the soft nuclear equation of state as extracted from subthreshold kaon production in heavy-ion collisions are used to derive an upper mass limit for compact stars. The interplay between the viscosity of strange quark matter and the gravitational wave emission from rotation-powered pulsars are outlined. The flux of strange quark matter nuggets in cosmic rays is put in perspective with a detailed numerical investigation of the merger of two strange stars. Finally, we discuss a novel scenario for the QCD phase transition in the early universe, which allows for a small inflationary period due to a pronounced first order phase transition at large baryochemical potential.

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“…Because the energy density of ADM ρ χχ cannot excess the energy density of dark radiation ρ DR [31], we find the following constraint on the energy density of ADM…”

Section: Direct Contribution a Methodsmentioning

confidence: 99%

“…For the direct contribution case, a constraint on the chemical potential for a fermionic light DM has been deduced from BBN calculation by Boeckel and S.-Bielich [31]. The correlation between the effective number of neutrinos and the cosmological parameters with light DM particles (including ADM) have been studied by Blennow et al [32].…”

Section: Indirect Contribution Casementioning

confidence: 99%

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Asymmetric dark matter and effective number of neutrinos

Kurosawa¹

2016

Proceedings of 11th International Workshop Dark Side of the Universe 2015 — PoS(DSU2015)

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We study the effect of the MeV-scale asymmetric dark matter annihilation on the effective number of neutrinos N eff at the epoch of the big bang nucleosynthesis. If the asymmetric dark matter χ couples more strongly to the neutrinos ν than to the photons γ and electrons e − , Γχγ,χe ≪ Γχν , or Γχγ,χe ≫ Γχν, the lower mass limit on the asymmetric dark matter is about 18 MeV for N eff ≃ 3.0.

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Cosmology of fermionic dark matter

Cited by 14 publications

References 46 publications

Majorana dark matter through a narrow Higgs portal

Majorana dark matter through a narrow Higgs portal

Strangeness in astrophysics and cosmology

Asymmetric dark matter and effective number of neutrinos

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