Inflation, (P)reheating and Neutrino Anomalies: Production of Sterile Neutrinos with Secret Interactions

Paul, Arnab; Ghoshal, Anish; Chatterjee, Arindam; Pal, Supratik

doi:10.1140/epjc/s10052-019-7348-5

Inflation, (P)reheating and Neutrino Anomalies: Production of Sterile Neutrinos with Secret Interactions

Aug 29, 2018

30 pages

Published in:

Eur.Phys.J.C 79 (2019) 10, 818

Published: Oct 4, 2019

e-Print:

1808.09706 [astro-ph.CO]

DOI:

10.1140/epjc/s10052-019-7348-5

View in:

ADS Abstract Service

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Abstract: (arXiv)

A number of experimental anomalies involving neutrinos hint towards the existence of at least an extra (a very light) sterile neutrino. However, such a species, appreciably mixing with the active neutrinos, is disfavored by different cosmological observations like Big Bang Nucleosynthesis (BBN), Cosmic Microwave Background (CMB) and Large Scale Structure (LSS). Recently, it was shown that the presence of additional interactions in the sterile neutrino sector via light bosonic mediators can make the scenario cosmologically viable by suppressing the production of the sterile neutrinos from active neutrinos via matter-like effect caused by the mediator. This mechanism works assuming the initial population of this sterile sector to be negligible with respect to that of the Standard Model (SM) particles, before the production from active neutrinos. However, there is fair chance that such bosonic mediators may couple to the inflaton and can be copiously produced during (p)reheating epoch. Consequently, they may ruin this assumption of initial small density of the sterile sector. In this article we, starting from inflation, investigate the production of such a sterile sector during (p)reheating in a large field inflationary scenario and identify the parameter region that allows for a viable early Universe cosmology.

Note:

16 pages; minor changes in language, footnotes and plots, references added

neutrino: sterile
boson: mediation
nucleosynthesis: big bang
reheating
inflation: model
cosmic background radiation: power spectrum
anomaly
cosmological model: parameter space
suppression
structure

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