Sterile Neutrino Decays During Weak Decoupling

Probing Beyond Standard Model (BSM) physics in the early universe provides an opportunity to address the relationship between modern cosmological observations and theoretical expectations. We explore the consequences of a population of sterile neutrinos that form very early in the history of the universe and decay around the time of weak decoupling. In this poster, we discuss the effects of these decays in generating a population of high-energy active neutrinos and a prodigious amount of entropy. We also discuss the total relativistic energy density, Big Bang Nucleosynthesis, and the cosmologically-inferred measurement of neutrino masses.