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Cosmic Diffuse Neutrino And Gamma-Ray Backgrounds In The Mev Regime, Ilukpitiye Samalka Anandagoda
Cosmic Diffuse Neutrino And Gamma-Ray Backgrounds In The Mev Regime, Ilukpitiye Samalka Anandagoda
All Dissertations
Cosmic Multi-Messenger backgrounds include relic diffuse components created in the early Universe and contributions from individual sources. In this dissertation, I present the work done in Anandagoda (2019); Anandagoda et al. (2020, 2023) where type Ia (SNe Ia) and core-collapse supernovae (CCSNe) contributions to the diffuse neutrino and gamma-ray backgrounds in the MeV regime are studied. These backgrounds are referred to as DSNB and DSGB respectively. Based on this work, the diffuse SN Ia background is ~106 times lower (for electron antineutrinos) than the CCSN background making it negligible. The predicted DSNB electron antineutrino flux at earth in the …
Core-Collapse Supernovae And Their Remnants: Chandra Study Of Sn 1987a And A Multi-Wavelength Follow-Up Of Sn 2021krf, Aravind Pazhayath Ravi
Core-Collapse Supernovae And Their Remnants: Chandra Study Of Sn 1987a And A Multi-Wavelength Follow-Up Of Sn 2021krf, Aravind Pazhayath Ravi
Physics Dissertations
Understanding how exploding stars impact their surroundings is of fundamental importance to all areas of astrophysics. Young supernovae (SNe) and their remnants open a window into directly studying the composition and distribution of the fresh products of nucleosynthesis. They also are instrumental in probing the ambient circumstellar medium (CSM), revealing the late-stage evolution of massive stars that culminates in a cataclysmic explosion. My thesis is divided into understanding the evolution of two core-collapse SNe: SN 1987A and SN 2021krf. Supernova (SN) 1987A is the closest observed SN (about 51 kpc) in the last 400 years and offers a unique opportunity …