Speaker:	Andrew Santos (Kavli IPMU, University of Tokyo)
Title:	In Pursuit of Ghostly Relics - The Diffuse Supernova Neutrino Background
Date (JST):	Tue, Nov 18, 2025, 11:00 - 12:00
Place:	Seminar Room A
Abstract:	Massive stars go out with a cataclysmic bang at the end of their lives. These core-collapse supernovae (CCSNe) shine bright not only in light but particularly in neutrinos. While such explosions are rare in our galaxy's vicinity (the last famously in 1987), reality gives rise to around one CCSN per second somewhere in the observable universe. With CCSNe so frequent and abundant in neutrinos, there must exist a Diffuse Supernova Neutrino Background (DSNB) surrounding us from all past CCSNe. We will discuss this unique nexus of particle physics, astrophysics, and cosmology - highlighting both what we can probe with a DSNB signal as well as the experimental hunt for its first detection using the Super-Kamiokande and Hyper-Kamiokande experiments.

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