ν Dark matter-philic Higgs for 3.5 keV X-ray signal

Haba, Naoyuki; Ishida, Hiroyuki; Takahashi, Ryo

doi:10.1016/j.physletb.2015.02.014

Cited by 19 publications

(11 citation statements)

References 65 publications

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“…Note that the minimal coupling to the SM already includes some production from the decays of scalars, namely pions [84][85][86] and SM Higgs particles [87,88], which is, however, sub-dominant compared to the thermal production from mixing. Higgs decay may give a significant contribution in models with an additional leptophilic (or, more generally, DM-philic) Higgs doublet, which can decay into N at much higher rate [89][90][91]. The N production may happen while the scalar field is in equilibrium (which is usually the case if it is charged) or while it "freezes in", leading to somewhat different phenomenology [53].…”

Section: Singlet Fermion Productionmentioning

confidence: 99%

Sterile neutrino Dark Matter production from scalar decay in a thermal bath

Drewes

Kang

2016

J. High Energ. Phys.

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Abstract:We calculate the production rate of singlet fermions from the decay of neutral or charged scalar fields in a hot plasma. We find that there are considerable thermal corrections when the temperature of the plasma exceeds the mass of the decaying scalar. We give analytic expressions for the temperature-corrected production rates in the regime where the decay products are relativistic. We also study the regime of non-relativistic decay products numerically. Our results can be used to determine the abundance and momentum distribution of Dark Matter particles produced in scalar decays. The inclusion of thermal corrections helps to improve predictions for the free streaming of the Dark Matter particles, which is crucial to test the compatibility of a given model with cosmic structure formation. With some modifications, our results may be generalised to the production of other Dark Matter candidates in scalar decays.

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Section: Singlet Fermion Productionmentioning

confidence: 99%

Sterile neutrino Dark Matter production from scalar decay in a thermal bath

Drewes

Kang

2016

J. High Energ. Phys.

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“…This however implies that keV sterile neutrinos with masses below 8 − 10 keV form hot dark matter (HDM), erase too much structure at small scales, and thus are excluded. This work is motivated by the recent hint for an X-ray line at approximately 3.55 keV by two analyses of the XMM-Newton data [28,29], which might be explained by sterile neutrino dark matter (DM) with a mass of approximately 7.1 keV [21,[30][31][32][33][34][35][36][37]. Other explanations for the line are given in refs.…”

Section: Jhep01(2015)006mentioning

confidence: 99%

A fresh look at keV sterile neutrino dark matter from frozen-in scalars

Adulpravitchai

Schmidt

2015

J. High Energ. Phys.

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Sterile neutrinos with a mass of a few keV can serve as cosmological warm dark matter. We study the production of keV sterile neutrinos in the early universe from the decay of a frozen-in scalar. Previous studies focused on heavy frozen-in scalars with masses above the Higgs mass leading to a hot spectrum for sterile neutrinos with masses below 8 − 10 keV. Motivated by the recent hints for an X-ray line at 3.55 keV, we extend the analysis to lighter frozen-in scalars, which allow for a cooler spectrum. Below the electroweak phase transition, several qualitatively new channels start contributing. The most important ones are annihilation into electroweak vector bosons, particularly W -bosons as well as Higgs decay into pairs of frozen-in scalars when kinematically allowed.

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“…Similar approaches involving new physics beyond the standard model can be found in Refs. [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Higgs-Dilaton cosmology: Universality versus criticality

Rubio

Shaposhnikov

2014

Phys. Rev. D

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The Higgs-Dilaton model is able to produce an early inflationary expansion followed by a dark energy dominated era responsible for the late time acceleration of the Universe. At tree level, the model predicts a small tensor-to-scalar ratio (0.0021 ≤ r ≤ 0.0034), a tiny negative running of the spectral tilt (−0.00057 ≤ dns/d ln k ≤ −0.00034) and a nontrivial consistency relation between the spectral tilt of scalar perturbations and the dark energy equation of state, which turns out to be close to a cosmological constant (0 ≤ 1 + wDE ≤ 0.014). We reconsider the validity of these predictions in the vicinity of the critical value of the Higgs self-coupling giving rise to an inflection point in the inflationary potential. The value of the inflationary observables in this case strongly depends on the parameters of the model. The tensor-to-scalar ratio can be large

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ν Dark matter-philic Higgs for 3.5 keV X-ray signal

Cited by 19 publications

References 65 publications

Sterile neutrino Dark Matter production from scalar decay in a thermal bath

Sterile neutrino Dark Matter production from scalar decay in a thermal bath

A fresh look at keV sterile neutrino dark matter from frozen-in scalars

Higgs-Dilaton cosmology: Universality versus criticality

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