Improved cosmological constraints on the neutrino mass and lifetime

Abellán, Guillermo Franco; Chacko, Zackaria; Dev, Abhish; Du, Peizhi; Poulin, Vivian; Tsai, Yuhsin

doi:10.1007/jhep08(2022)076

Cited by 25 publications

(16 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reference [1520] proposes a scenario in which the CνB decays non-relativistically into massless, invisible particles with a lifetime of τ ν ∼ 0.1 Myr. Then, cosmological data can tolerate m ν 0.42 eV, i.e., more than three times the allowed region of the standard ΛCDM benchmark m ν 0.12 eV.…”

Section: Caveat 2: Model Dependencementioning

confidence: 99%

See 1 more Smart Citation

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

View full text Add to dashboard Cite

With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.

show abstract

Section: Caveat 2: Model Dependencementioning

confidence: 99%

“…Shorter lifetimes could conceivably lead to the same outcome. However, as the modelling of neutrino decay in cosmology is generally non-trivial [1521,1522] and the result of [1520] is already at the edge of validity of their non-relativistic approximation, this possibility remains unexplored.…”

Section: Caveat 2: Model Dependencementioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

View full text Add to dashboard Cite

show abstract

“…III and IV, respectively. Expression (57) shows the relation between s The entries of U Lep in Eq. ( 55) get the following ranges: (75)…”

Section: B Numerical Analysis For Lepton Sectormentioning

confidence: 99%

“…References Constraints [10] ν m ν < 130 meV (NO) ν m ν < 150 meV (NO) [52] ν m ν < 120 ÷ 690 meV [53,54] ν m ν < 120 meV [55] ν m ν < 180 meV (NO) ν m ν < 210 meV (NO) [56] ν m ν < 210 meV [57] ν m ν < 420 meV Here are some comments related to the neutrino mass issue:…”

Section: B Numerical Analysis For Lepton Sectormentioning

confidence: 99%

Fermion masses and mixings in an extended SM based on A4 flavor symmetry with the linear seesaw for majorana neutrino

Vien¹

2023

Preprint

View full text Add to dashboard Cite

We propose a U (1) L model with A 4 symmetry in light of the linear seesaw for majorana neutrino that capable of generating the current lepton and quark mass and mixing patterns. The smallness of Majorana neutrino mass is reproduced through the linear seesaw mechanism. The model can accommodate the current observed patterns of lepton and quark mixing in which the solar neutrino mixing angle and the Dirac CP violating phase are in 2σ range for both NO and IO, the Majorana violating phases are predicted to be η 1 ∈ (2.29, 10.31) • and η 2 ∈ (57.30, 302.70) • for NO while η 1 ∈ (3.44, 10.31) • and η 2 ∈ (79.07, 87.09) • for IO. The obtained sum of neutrino mass and the effective Majorana neutrino mass are in good consistent with the recent upper limits. For quark sector, all the quark masses can get the best-fit values and all the elements of the quark mixing matrix are in agreement with the experimental constraints except one element, (V CKM ) 21 , with a deviation about 0.25 % deviation.

show abstract

“…Studies of decaying massive neutrinos emerged several decades ago (e.g. [34,35] and references therein) when it was realized that finite neutrino lifetimes may significantly relax the bounds on the neutrino mass sum (for the most recent constraints, see [36][37][38][39]). It is only recently, with the work of reference [40], that decaying warm dark matter (DWDM) has been investigated explicitly.…”

Section: Jcap08(2022)044mentioning

confidence: 99%

Decaying warm dark matter revisited

Holm¹,

Tram²,

Hannestad³

2022

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Decaying dark matter models provide a physically motivated way of channeling energy between the matter and radiation sectors. In principle, this could affect the predicted value of the Hubble constant in such a way as to accommodate the discrepancies between CMB inferences and local measurements of the same. Here, we revisit the model of warm dark matter decaying non-relativistically to invisible radiation. In particular, we rederive the background and perturbation equations starting from a decaying neutrino model and describe a new, computationally efficient method of computing the decay product perturbations up to large multipoles. We conduct MCMC analyses to constrain all three model parameters, for the first time including the mass of the decaying species, and assess the ability of the model to alleviate the Hubble and σ 8 tensions, the latter being the discrepancy between the CMB and weak gravitational lensing constraints on the amplitude of matter fluctuations on an 8 h -1 Mpc-1 scale. We find that the model reduces the H 0 tension from ∼ 4σ to ∼ 3σ and neither alleviates nor worsens the S 8 ≡ σ 8 (Ω m /0.3)0.5 tension, ultimately showing only mild improvements with respect to ΛCDM. However, the values of the model-specific parameters favoured by data is found to be well within the regime of relativistic decays where inverse processes are important, rendering a conclusive evaluation of the decaying warm dark matter model open to future work.

show abstract

Improved cosmological constraints on the neutrino mass and lifetime

Cited by 25 publications

References 70 publications

Feebly-interacting particles: FIPs 2020 workshop report

Feebly-interacting particles: FIPs 2020 workshop report

Fermion masses and mixings in an extended SM based on A4 flavor symmetry with the linear seesaw for majorana neutrino

Decaying warm dark matter revisited

Contact Info

Product

Resources

About