MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles
| Autor: | Kazunori Kohri, Thomas Tram, Steen Hannestad, Rasmus S. L. Hansen, Nagisa Hiroshima, Takuya Hasegawa |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Range (particle radiation) Cosmology and Nongalactic Astrophysics (astro-ph.CO) cosmological neutrinos Scale (ratio) Big bang nucleosynthesis 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Hadron FOS: Physical sciences Astronomy and Astrophysics 01 natural sciences Nuclear physics High Energy Physics - Phenomenology Thermalisation High Energy Physics - Phenomenology (hep-ph) Nucleosynthesis 0103 physical sciences Radiative transfer Particle physics of the early universe High Energy Physics::Experiment Neutrino Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Hasegawa, T, Hiroshima, N, Kohri, K, Hansen, R S L, Tram, T & Hannestad, S 2019, ' MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles ', Journal of Cosmology and Astroparticle Physics, vol. 2019, no. 12, 012, pp. 012 . https://doi.org/10.1088/1475-7516/2019/12/012 |
| Popis: | 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 $T_{\rm RH} \gtrsim 1.8$ MeV in the case of the 100% radiative decay, and $T_{\rm RH} \gtrsim$ 4-5 MeV in the case of the 100% hadronic decays for particle masses in the range of 10 GeV to 100 TeV. 37 pages, 13 figures, to appear in JCAP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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