Constraints on sterile neutrinos lifetime from primordial nucleosynthesis

Leiden Repository

Constraints on sterile neutrinos lifetime from primordial nucleosynthesis

Type: Master thesis
Title: Constraints on sterile neutrinos lifetime from primordial nucleosynthesis
Author: Magalich, Andrii
Issue Date: 2015-07-31
Keywords: Primordial nucleosynthesis
Beyond the Standard Model physics
Sterile neutrinos
Abstract: Big Bang Nucleosynthesis theory together with Hubble expansion law, Cosmic Microwave Background and Large-Scale structure formation constitute the basis of experimental confirmations of the Standard Cosmology. Primordial nucleosynthesis observables are very sensitive to the details of particle physics at the time of formation of the first nuclei. We analyze the influence of the heavy sterile neutrinos on the primordial plasma and abundances of light chemical elements (H, He, Li incl. isotopes) using the numerical simulations of non-equilibrium particle dynamics in the expanding Universe. Next, demanding the computed abundances to be consistent with modern measurements, we can limit the mass-lifetime parameter space of sterile neutrinos. The obtained constraints will complement the experimental constraints from direct accelerator searches, including currently planned experiments. We apply this approach to the Neutrino Minimal Standard Model that aims to explain simultaneously 3 Beyond the Standard Model problems: dark matter, neutrino oscillations and baryon asymmetry of the Universe.
Supervisor: Boyarsky, Alexey
Faculty: Faculty of Science
Department: Physics (Master)
Specialisation: Research in Theoretical Physics
ECTS Credits: 8
Handle: http://hdl.handle.net/1887/37136
 

Files in this item

Description Size View
application/pdf Thesis.pdf 1.784Mb View/Open

This item appears in the following Collection(s)