Learning the High Redshift Universe Using Nano-hertz and Hecto-hertz Gravitational Wave Background

Explore a 47-minute lecture from the International Centre for Theoretical Sciences that delves into gravitational wave detection and its implications for understanding the high redshift universe. Learn about the groundbreaking experimental detection of gravitational waves from merging black holes and neutron stars, and discover how these waves can probe physics beyond the Standard Model. Understand various sources of gravitational waves including inflation-related tensor perturbations, Primordial Black Holes (PBH), cosmological first-order Phase Transitions, and topological defects like cosmic strings and domain walls. Examine recent findings from NANO-Grav, InPTA, and other PTA collaborations regarding the first evidence of Stochastic Gravitational Wave Background (SGWB) detection. Part of the comprehensive program "Hearing beyond the standard model with cosmic sources of Gravitational Waves," this lecture connects particle physics, cosmology, and gravitational wave research to explore the possibilities of detecting SGWB and understanding modifications to general relativity.