Sterile neutrinos in the early universe

Leiden Repository

Sterile neutrinos in the early universe

Type: Doctoral Thesis
Title: Sterile neutrinos in the early universe
Author: Ivashko, Artem
Publisher: Lorentz Insititute, Theoretical Cosmology GroupFaculty of Science, Leiden University
Issue Date: 2015-12-09
Keywords: Sterile neutrinos
Early Universe
BBN
NuMSM
Chiral magnetic effect
Abstract: Although the Standard Model of elementary particles successfully describes the Universe up to the smallest known scales, we know that there exists a number of observational phenomena, which do not find explanation in the framework of this theory. Among these problems are Neutrino Oscillations, Dark Matter and the Baryon Asymmetry of the Universe. In this thesis, we are studying the Neutrino Minimal Standard Model (nuMSM), a minimalistic extension of the Standard Model, which can explain all these three phenomena simultaneously, by adding only three right-handed neutrinos to the known three left-handed neutrinos. It is shown that the two heavier sterile neutrinos with masses below the mass of pi-meson, could have been present in such large amounts in the early Universe that they spoil the otherwise excellent agreement between the Standard-Model prediction of light nuclei production during the Big-Bang Nucleosynthesis and the astrophysical observations. In this way, masses of sterile neutrinos are excluded from below, which reduces the potentially interesting parameter space for future accelerator searches. Another effect of sterile neutrinos in the early Universe that is studied is the production of large-scale magnetic fields due to the so-called Chiral Magnetic Effect.
Description: Promotor: A. Achúcarro, Co-promotor: A. Boyarsky
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Ivashko, a., 2015, Doctoral Thesis, Leiden University
Series/Report no.: Casimir PhD series Delft-Leiden;2015-30
ISBN: 9789085932369
Handle: http://hdl.handle.net/1887/36523
 

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