Degenerate Sub-keV fermion dark matter from a solution to the Hubble tension

Choi, Gongjun; Suzuki, Motoo; Yanagida, Tsutomu T.

doi:10.1103/physrevd.101.075031

Cited by 27 publications

(17 citation statements)

References 58 publications

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“…In this light, a large number of potential solutions have been proposed which typically fall into one of two categories: those which modify the Universe at late times (z 1) and those which modify the dynamics and evolution near recombination (10 3 z 10 5 ) -we refer the reader to [25][26][27][28][29][30][31][32] and to [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] for several recent proposals of each type, and to [50] for a recent comprehensive review of models. Cosmological observations from type Ia supernovae and baryonic acoustic oscillations (BAO) severely limit the viability of late-time solutions (see e.g.…”

Section: Introductionmentioning

confidence: 99%

The hubble tension as a hint of leptogenesis and neutrino mass generation

Escudero

Witte

2021

Eur. Phys. J. C

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The majoron, a neutrinophilic pseudo-Goldstone boson conventionally arising in the context of neutrino mass models, can damp neutrino free-streaming and inject additional energy density into neutrinos prior to recombination. The combination of these effects for an eV-scale mass majoron has been shown to ameliorate the outstanding $$H_0$$ H 0 tension, however only if one introduces additional dark radiation at the level of $$\Delta N_{\mathrm{eff}} \sim 0.5$$ Δ N eff ∼ 0.5 . We show here that models of low-scale leptogenesis can naturally source this dark radiation by generating a primordial population of majorons from the decays of GeV-scale sterile neutrinos in the early Universe. Using a posterior predictive distribution conditioned on Planck2018+BAO data, we show that the value of $$H_0$$ H 0 observed by the SH$$_0$$ 0 ES collaboration is expected to occur at the level of $$\sim 10\%$$ ∼ 10 % in the primordial majoron cosmology (to be compared with $$\sim 0.1\%$$ ∼ 0.1 % in the case of $$\Lambda $$ Λ CDM). This insight provides an intriguing connection between the neutrino mass mechanism, the baryon asymmetry of the Universe, and the discrepant measurements of $$H_0$$ H 0 .

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Section: Introductionmentioning

confidence: 99%

The hubble tension as a hint of leptogenesis and neutrino mass generation

Escudero

Witte

2021

Eur. Phys. J. C

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“…Afterwards, nonrelativistic Φ 16 decays to the DM pair when the time of ΓðΦ 16 → ψ 8 þ ψ 8 Þ ≃ H is reached. The similar scenario was considered in [48,54]. We argue that DM does not exist at the reheating era and is produced only from the decay of Φ 16 .…”

Section: A the Case With Formation Of Dark Sector Thermal Bathmentioning

confidence: 52%

Degenerate fermion dark matter from a broken U(1)B−L gauge symmetry

2020

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The extension of the Standard Model by assuming Uð1Þ B-L gauge symmetry is very well motivated since it naturally explains the presence of heavy right-handed neutrinos required to account for the small active neutrino masses via the seesaw mechanism and thermal leptogenesis. Traditionally, we introduce three right-handed neutrinos to cancel the ½Uð1Þ B-L 3 anomaly. However, it suffices to introduce two heavy righthanded neutrinos for these purposes and therefore we can replace one right-handed neutrino by new chiral fermions to cancel the Uð1Þ B-L gauge anomaly. Then, one of the chiral fermions can naturally play a role of a dark matter candidate. In this paper, we demonstrate how this framework produces a dark matter candidate which can address the so-called "core-cusp problem". As one of the small-scale problems that the Λ cold dark matter paradigm encounters, it may imply an important clue for the nature of dark matter. One of resolutions among many is hypothesizing that sub-keV fermion dark matter halos in dwarf spheroidal galaxies are in a (quasi) degenerate configuration. We show how the degenerate sub-keV fermion dark matter candidate can be nonthermally originated in our model and thus can be consistent with the Lyman-α forest observation. Thereby, the small neutrino mass, baryon asymmetry, and the sub-keV dark matter become consequences of the broken B-L gauge symmetry.

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“…Both decaying (dark) matter solutions, as well as growing density-component solutions are very active areas of research. Because of this, we will not try to give an overview here of the candidates, but merely point to a number of recent papers [32,33,34,35,36,37,38,39] as a starting point for the interested reader, together with the more complete literature survey provided in [12]. By breaking Assumption 7, such solutions can increase H(0) relative to H(z) (where z > 0) more than would otherwise be possible.…”

Section: Breaking Post-recombination Assumptionsmentioning

confidence: 99%

A structured analysis of Hubble tension

Beenakker,

Venhoek

2021

Preprint

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As observations of the Hubble parameter from both early and late sources have improved, the tension between these has increased to be well above the 5σ threshold. Given this, the need for an explanation of such a tension has grown. In this paper, we explore a set of 7 assumptions, and show that, in order to alleviate the Hubble tension, a model needs to break at least one of these 7, providing a quick and easy to apply check for new model proposals. We also use this framework to make a rough categorisation of current proposed models, and show the existence of at least one under-explored avenue of alleviating the Hubble tension.

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Degenerate Sub-keV fermion dark matter from a solution to the Hubble tension

Cited by 27 publications

References 58 publications

The hubble tension as a hint of leptogenesis and neutrino mass generation

The hubble tension as a hint of leptogenesis and neutrino mass generation

Degenerate fermion dark matter from a broken U(1)B−L gauge symmetry

A structured analysis of Hubble tension

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