2020
DOI: 10.1103/physrevd.101.075031
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Degenerate Sub-keV fermion dark matter from a solution to the Hubble tension

Abstract: We present a dark sector model addressing both the Hubble tension and the core-cusp problem. The model is based on a hidden Abelian gauge symmetry group with some chiral fermions required by the anomaly cancellation conditions, producing a candidate for the decaying fermion dark matter as a solution to the Hubble tension. Moreover, the sub-keV mass regime and the thermal history of the dark sector help the dark matter candidate resolve the core-cusp problem occurring in the standard ΛCDM cosmology.

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Cited by 28 publications
(17 citation statements)
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References 58 publications
(119 reference statements)
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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%
“…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%
“…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%
“…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%