MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles

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MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles. / Hasegawa, Takuya; Hiroshima, Nagisa; Kohri, Kazunori; Hansen, Rasmus S. L.; Tram, Thomas ; Hannestad, Steen.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2019, No. 12, 012, 12.2019, p. 012.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

Bibtex

@article{be1a05f9a1f74ae3bb6b9e0b682c31f0,

title = "MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles",

abstract = "From a theoretical point of view, there is a strong motivation to consider an MeV-scale reheating temperature induced by long-lived massive particles with masses around the weak scale, decaying only through gravitational interaction. In this study, we investigate lower limits on the reheating temperature imposed by big-bang nucleosynthesis assuming both radiative and hadronic decays of such massive particles. For the first time, effects of neutrino self-interactions and oscillations are taken into account in the neutrino thermalization calculations. By requiring consistency between theoretical and observational values of light element abundances, we find that the reheating temperature should conservatively be T RH ≳ 1.8 MeV in the case of the 100% radiative decay, and T RH ≳ 4-5 MeV in the case of the 100% hadronic decays for particle masses in the range of 10 GeV to 100 TeV. ",

keywords = "Big bang nucleosynthesis, cosmological neutrinos, physics of the early universe",

author = "Takuya Hasegawa and Nagisa Hiroshima and Kazunori Kohri and Hansen, {Rasmus S. L.} and Thomas Tram and Steen Hannestad",

year = "2019",

month = dec,

doi = "10.1088/1475-7516/2019/12/012",

language = "English",

volume = "2019",

pages = "012",

journal = "Journal of Cosmology and Astroparticle Physics",

issn = "1475-7516",

publisher = "IOP Publishing",

number = "12",

}

RIS

TY - JOUR

T1 - MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles

AU - Hasegawa, Takuya

AU - Hiroshima, Nagisa

AU - Kohri, Kazunori

AU - Hansen, Rasmus S. L.

AU - Tram, Thomas

AU - Hannestad, Steen

PY - 2019/12

Y1 - 2019/12

N2 - From a theoretical point of view, there is a strong motivation to consider an MeV-scale reheating temperature induced by long-lived massive particles with masses around the weak scale, decaying only through gravitational interaction. In this study, we investigate lower limits on the reheating temperature imposed by big-bang nucleosynthesis assuming both radiative and hadronic decays of such massive particles. For the first time, effects of neutrino self-interactions and oscillations are taken into account in the neutrino thermalization calculations. By requiring consistency between theoretical and observational values of light element abundances, we find that the reheating temperature should conservatively be T RH ≳ 1.8 MeV in the case of the 100% radiative decay, and T RH ≳ 4-5 MeV in the case of the 100% hadronic decays for particle masses in the range of 10 GeV to 100 TeV.

AB - From a theoretical point of view, there is a strong motivation to consider an MeV-scale reheating temperature induced by long-lived massive particles with masses around the weak scale, decaying only through gravitational interaction. In this study, we investigate lower limits on the reheating temperature imposed by big-bang nucleosynthesis assuming both radiative and hadronic decays of such massive particles. For the first time, effects of neutrino self-interactions and oscillations are taken into account in the neutrino thermalization calculations. By requiring consistency between theoretical and observational values of light element abundances, we find that the reheating temperature should conservatively be T RH ≳ 1.8 MeV in the case of the 100% radiative decay, and T RH ≳ 4-5 MeV in the case of the 100% hadronic decays for particle masses in the range of 10 GeV to 100 TeV.

KW - Big bang nucleosynthesis

KW - cosmological neutrinos

KW - physics of the early universe

U2 - 10.1088/1475-7516/2019/12/012

DO - 10.1088/1475-7516/2019/12/012

M3 - Journal article

VL - 2019

SP - 012

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 12

M1 - 012

ER -