A model for mixed warm and hot right-handed neutrino dark matter

Dutra, Maíra; Oliveira, Vinícius; Pires, C. A. de S.; Queiroz, Farinaldo S.

doi:10.48550/arxiv.2104.14542

Cited by 2 publications

(2 citation statements)

References 39 publications

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“…As a remedy, the relic can be brought down to the observed limit by late time entropy production due to decay of another long lived RH neutrino. Earlier, such dilution mechanism of keV scale dark matter abundance from long lived heavier RHN decay has been studied in a broader class of models having U (1) B−L gauge symmetry without accommodating cosmic inflation by the authors of [30][31][32][33][34][35]. Here we revisit the analysis in the minimal gauged B−L model by including the cosmic inflation.…”

Section: Introductionmentioning

confidence: 93%

Thermal keV dark matter in a gauged B-L model with cosmic inflation

Borah¹,

Jyoti²,

Saha³

2021

Preprint

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We investigate the possibility of keV scale thermal dark matter in a minimal gauged B − L extension of the standard model with three right-handed neutrinos in the context of cosmic inflation. The complex singlet scalar field responsible for the spontaneous breaking of B −L gauge symmetry is non-minimally coupled to gravity and serves the role of inflaton. The lightest right-handed neutrino N1 can be a dark matter candidate if its couplings to leptons are sufficiently suppressed or forbidden. While keV scale N1 gives rise to the possibility of warm dark matter, its thermal production leads to over-abundance. The subsequent entropy dilution due to heavier right-handed neutrino decay can bring the DM abundance within the observed limit. We constrain the model parameters from the requirement of producing sufficient entropy dilution, inflationary observables along with other phenomenological constraints. While these requirements cannot satisfy light neutrino data, suitable extension of the minimal model can accommodate it.

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Section: Introductionmentioning

confidence: 93%

Thermal keV dark matter in a gauged B-L model with cosmic inflation

Borah¹,

Jyoti²,

Saha³

2021

Preprint

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“…On the other hand, when a field which is part of the thermal bath (as all SM fields) becomes non-relativistic, behaving as matter, its energy density is exponentially suppressed and stops contributing to the total energy density of the universe. Decoupled and long-lived BSM fields can lead to early matter-dominated (EMD) periods prior to BBN in many well-motivated models [9][10][11][12][13][14]. For sufficiently long-lived matter components, EMD periods are followed by reheating periods (also required to end prior to BBN), in which a significant amount of entropy is injected into the SM bath [15].…”

Section: Introductionmentioning

confidence: 99%

EvoEMD: cosmic evolution with an early matter-dominated era

Dutra

Wu²

2021

Preprint

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We present EvoEMD, a framework to calculate the evolution of cosmic relics in a Universe with an early matter-dominated (EMD) era. There are mainly two aspects to consider in this regard. First, an EMD era changes the Hubble expansion rate with respect to the standard radiation-dominated (RD) universe. Second, when the EMD era ends, the out-of-equilibrium decay of the dominant matter component may reheat the thermal bath and dilute cosmic relics. We will briefly introduce the cosmology with an EMD era, and then present how it is implemented in the EvoEMD framework. Users can study the coupled evolution of different interacting species in an EMD or RD universe. Two important cosmic relics are dark matter and a net lepton number. In order to show the capabilities of EvoEMD, we include simple examples of dark matter produced via freeze-out and freeze-in, and also of leptogenesis. Moreover, users can modify the model files in order to explore different new physics scenarios. EvoEMD is hosted on Github at https://github.com/ycwu1030/EvoEMD.

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A model for mixed warm and hot right-handed neutrino dark matter

Cited by 2 publications

References 39 publications

Thermal keV dark matter in a gauged B-L model with cosmic inflation

Thermal keV dark matter in a gauged B-L model with cosmic inflation

EvoEMD: cosmic evolution with an early matter-dominated era

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