Unstable cosmic neutrino capture

Akita, Kensuke; Lambiase, Gaetano; Yamaguchi, Masahide

doi:10.1007/jhep02(2022)132

Cited by 9 publications

(3 citation statements)

References 72 publications

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“…If observations and theoretical estimations of the CνB spectrum are improved significantly, we will obtain much richer information about neutrino physics and the early universe. Through direct observations of the CνB, one can impose significant constraints on neutrino decays and lifetimes in the region of the age of the universe, t 0 = 4.35 × 10 17 s [34,71]. The CνB spectrum would also have fluctuations imprinted by inflationary perturbations.…”

Section: Discussionmentioning

confidence: 99%

A Review of Neutrino Decoupling from the Early Universe to the Current Universe

Akita

Yamaguchi

2022

Universe

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We review the distortions of spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early universe. We solve integro-differential kinetic equations for the neutrino density matrix, including vacuum three-flavor neutrino oscillations, oscillations in electron and positron background, a collision term and finite temperature corrections to electron mass and electromagnetic plasma up to the next-to-leading order O(e3). After that, we estimate the effects of the spectral distortions in neutrino decoupling on the number density and energy density of the Cosmic Neutrino Background (CνB) in the current universe, and discuss the implications of these effects on the capture rates in direct detection of the CνB on tritium, with emphasis on the PTOLEMY-type experiment. In addition, we find a precise value of the effective number of neutrinos, Neff=3.044. However, QED corrections to weak interaction rates at order O(e2GF2) and forward scattering of neutrinos via their self-interactions have not been precisely taken into account in the whole literature so far. Recent studies suggest that these neglections might induce uncertainties of ±(10−3−10−4) in Neff.

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Section: Discussionmentioning

confidence: 99%

A Review of Neutrino Decoupling from the Early Universe to the Current Universe

Akita

Yamaguchi

2022

Universe

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“…The definition of the collision integrals with all information of the flavour and particleantiparticle coherences is a very delicate problem, whose importance has been recently emphasized [52]. Although some computations in the absence of the particle-antiparticle mixing exist [51,[74][75][76][77][78][79] and even some others that do include them [45][46][47], a complete and comprehensive treatment of the forward scattering terms and collision integrals with the most general mixing structure and arbitrary neutrino masses and kinematics has not existed so far. In ref.…”

Section: Discussionmentioning

confidence: 99%

Quantum transport theory for neutrinos with flavor and particle-antiparticle mixing

Kainulainen,

Parkkinen

2024

J. High Energ. Phys.

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We derive quantum kinetic equations for mixing neutrinos including consistent forward scattering terms and collision integrals for coherent neutrino states. In practice, we reduce the general Kadanoff-Baym equations in a few clearly justified steps to a generalized density matrix equation that describes both the flavour- and particle-antiparticle coherences and is valid for arbitrary neutrino masses and kinematics. We then reduce this equation to a simpler particle-antiparticle diagonal limit and eventually to the ultra-relativistic limit. Our derivation includes simple Feynman rules for computing collision integrals with the coherence information. We also expose a novel spectral shell structure underlying the mixing phenomenon and quantify how the prior information on the system impacts on the QKE’s, leading to a direct effect on its evolution. Our results can be used for example to accurately model neutrino distributions in hot and dense environments and to study the production and decay of mixing heavy neutrinos in colliders.

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“…In this experiment, it is expected that around 4 events for Dirac neutrinos and 8 events for Majorana neutrinos per year could be detected on this target. Although the direct detection of the CνB signal seems challenging with small neutrino masses, several phenomenological aspects and sensitivity estimates of PTOLEMY experiment have been done in the Literature [25][26][27][28][29][30][31][32].…”

Section: Jcap06(2023)021mentioning

confidence: 99%

Probing sterile neutrino dark matter in the PTOLEMY-like experiment

Choi

Lkhagvadorj

Yoo

2023

J. Cosmol. Astropart. Phys.

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We study the prospect to detect the cosmic background of sterile neutrinos in the tritium β-decay, such as the PTOLEMY-like experiments. The sterile neutrino with mass between 1 eV–10 keV may contribute to the local density as warm or cold dark matter component. In this study, we investigate the possibility for searching them in the models with different production in the early Universe, without assuming sterile neutrino as full dark matter component. In these models, especially with low-reheating temperature and late-time phase transition, the capture rate per year can be greatly enhanced to be 𝒪(10) around the mass range 10–100 eV without violating other astrophysical and cosmological observations.

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Unstable cosmic neutrino capture

Cited by 9 publications

References 72 publications

A Review of Neutrino Decoupling from the Early Universe to the Current Universe

A Review of Neutrino Decoupling from the Early Universe to the Current Universe

Quantum transport theory for neutrinos with flavor and particle-antiparticle mixing

Probing sterile neutrino dark matter in the PTOLEMY-like experiment

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