Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound

Bhattacharya, Sukannya; Das, Subinoy; Dutta, Koushik; Gangopadhyay, Mayukh Raj; Mahanta, Ratul; Maharana, Anshuman

doi:10.48550/arxiv.2009.05987

Cited by 2 publications

(6 citation statements)

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“…Concretely, we have considered nonthermal HDM produced as decay products of the inflaton. Such particles have the momentum distribution associated with decays taking place in a matter dominated universe evolving to radiation domination, as shown in [28]. However, we have argued that any model leading to the same ∆N eff and m eff sp as our model (barring additional new physics ingredients) would lead to similar effects on cosmological observables, and therefore our constraints generically apply to any HDM models.…”

Section: Discussionmentioning

confidence: 64%

“…We will be making use of publicly available package CLASS [41][42][43] to incorporate the effects of the sterile particles, the input required for this the momentum distribution of the sterile particles today. This was obtained in [28] to be…”

Section: A the Modelmentioning

confidence: 98%

“…In this section, we will review the basics of the production mechanism and the form of the momentum distribution that we will be considering. Our discussion will be brief, we refer the reader to [28] and the references therein for the details. At early times, the energy density of the universe will be taken to be dominated by cold particles of a species ϕ.…”

Section: A the Modelmentioning

confidence: 99%

“…) where ρ 0 c is the critical density today and h the reduced Hubble parameter. In our model, the effective parameters m eff and ∆N eff in terms of the microscopic parameters are given by [28]:…”

Section: B Mapping Onto Generic Parametersmentioning

confidence: 99%

“…The study of the implications of sterile particles with this momentum distribution for precision cosmology was recently initiated 1 in Ref. [28]. Given that the effect of massive sterile particles on the CMB and matter power spectra is well-known (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension

Das,

Maharana,

Poulin

et al. 2021

Preprint

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The ΛCDM prediction of S8 ≡ σ8(Ωm/0.3) 0.5 -where σ8 is the root mean square of matter fluctuations on a 8 h −1 Mpc scale -once calibrated on Planck CMB data is 2 − 3σ lower than its direct estimate by a number of weak lensing surveys. In this paper, we explore the possibility that the 'S8-tension' is due to a non-thermal hot dark matter (HDM) fractional contribution to the universe energy density leading to a power suppression at small-scales in the matter power spectrum. Any HDM models can be characterized by its effective mass m eff sp and its contribution to the relativistic degrees of freedom at CMB decoupling ∆N eff . Taking the specific example of a sterile particle produced from the decay of the inflaton during a matter dominated era, we find that from Planck only the tension can be reduced below 2σ, but Planck does not favor a non-zero {m eff sp , ∆N eff }. In combination with a measurement of S8 from KIDS1000+BOSS+2dfLenS, the S8-tension would hint at the existence of a particle of mass m eff sp 0.67 +0.26 −0.48 eV with a contribution to ∆N eff 0.06 ± 0.05. However, Pantheon and BOSS BAO/f σ8 data restricts the particle mass to m eff sp 0.48 +0.17 −0.36 and contribution to ∆N eff 0.046 +0.004 −0.031 . We discuss implications of our results for other canonical non-thermal HDM models-the Dodelson-Widrow model and a thermal sterile particle with a different temperature in the hidden sector. We report competitive results on such hidden sector temperature which might have interesting implications for particle physics model building, in particular connecting the S8-tension to the longstanding short baseline oscillation anomaly.

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Section: Discussionmentioning

confidence: 64%

Section: A the Modelmentioning

confidence: 98%

Section: A the Modelmentioning

confidence: 99%

Section: B Mapping Onto Generic Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension

Das,

Maharana,

Poulin

et al. 2021

Preprint

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Late time acceleration due to generic modification of gravity and Hubble tension

Adil,

Gangopadhyay,

Sami

et al. 2021

Preprint

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We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The possibility is realized by assuming an interaction between dark matter and the baryonic component in the Einstein frame which is removed by going to the Jordan frame using a disformal transformation giving rise to an exotic effective fluid responsible for causing phantom crossing at late times. In this scenario, past evolution is not distinguished from ΛCDM but late time dynamics is generically different due to the presence of phantom crossing that causes a monotonous increase in the expansion rate giving rise to distinctive late-time cosmic feature. The latter can play a crucial role in addressing the tension between the observed value of Hubble parameter by CMB (Cosmic Microwave Background) measurements and the local observations. We demonstrate that the Hubble tension significantly reduces in the scenario under consideration for the chosen scale factor parametrizations. The estimated age of the universe in the model is well within the observational bounds in the low and high red-shift regimes.

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Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound

Cited by 2 publications

References 52 publications

Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension

Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension

Late time acceleration due to generic modification of gravity and Hubble tension

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