When a burst of neutrinos from a core-collapse supernova (CCSN) passes by the Earth, it causes a permanent change in the local space-time metric, called the gravitational wave (GW) memory. Long considered unobservable, this effect will be detectable in the near future, for a galactic supernova, at deci-Hertz GW interferometers. I will present a new phenomenological description of the memory, highlight its detectability and physics potential in the context of multi-messenger astronomy. I will also discuss the novel idea of memory-triggered supernova neutrino detection. Recent numerical simulations of CCSN, also reveal a considerable flux of neutrinos emitted prior to the core-collapse, called pre-supernova neutrinos. I will focus on how these neutrinos can be used in localizing a progenitor to aid astronomy, GW and exotic physics searches, and hence act as an early warning system.

I will also briefly mention my work on studying dynamical quantum fields on classical backgrounds, which is relevant to cosmology and phase transitions.