Astrophysics Webinar

Astrophysics of Compact Objects: Pathways to Testing Gravity and Cosmology

Speaker: Dr. Surajit Kalita (University of Warsaw, Poland)

Date and time
Venue
Online - Zoom

Abstract

Fast radio bursts (FRBs), one of the rare classes of astronomical phenomena observed at cosmological distances, present a novel avenue for probing fundamental physics and cosmology. Key open questions in modern physics, such as the Hubble tension, nature of dark matter, and origin of ultra-high-frequency gravitational waves (GWs), may be addressed by combining FRB observations with novel statistical frameworks and machine learning approaches integrated with theory. 

Concurrently, compact stellar remnants, particularly white dwarfs (WDs), provide robust astrophysical laboratories for testing the fundamental physics. High-precision WD datasets from Gaia, Kepler, and SDSS enable to provide constraints on the variation of fundamental constants, tests of modified gravity theories, and predictions of GW signals to be probed by upcoming observatories such as LISA. I will conclude by outlining how multi-messenger approaches, connecting FRBs, WDs, and GWs, can deepen our understanding of the universe.