Date of Award
Spring 5-15-2015
Author's School
College of Arts & Sciences
Author's Department/Program
Physics
Degree Name
Bachelor of Arts
Abstract
Exploring potential effects of the neutrino’s mass can reveal new and exciting knowledge about the universe. In the standard cosmological model, neutrinos decoupled from the primordial plasma at T ∼ 1.5 MeV and then began free-streaming. However, the presence of new interactions in the neutrino sector, such as those responsible for neutrino mass, can significantly delay the onset of neutrino free-streaming. These effects alter the anisotropic stress history, which is measurable with observables like the Cosmic Microwave Background (CMB) and matter clustering. For the first time, we study the cosmological physics of self-interacting neutrinos while self-consistently taking into account the neutrino mass. We present the results of numerically implementing the mass corrected collision term in the Boltzmann equation. We find the neutrino mass and self-interaction have an additive damping effect on the matter power spectrum for small scales and alter the phase and amplitude of the CMB temperature power spectrum.
Language
English (en)
Advisor/Committee Chair
Francesc Ferrer
Advisor/Committee Chair's Department
Physics
Recommended Citation
Kreisch, Christina D.; Cyr-Racine, Francis-Yan; Doré, Olivier P.; Ferrer, Francesc; Seiffert, Mike; and Sigurdson, Kris, "Cosmological Signatures of Massive Self-Interacting Neutrinos" (2015). Undergraduate Theses—Restricted. 46.
https://openscholarship.wustl.edu/undergrad_honors/46