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Explore a 48-minute lecture on pulsar timing arrays and their applications in cosmology, delivered at the International Centre for Theoretical Sciences as part of the "Hearing beyond the standard model with cosmic sources of Gravitational Waves" program. Delve into the groundbreaking research of gravitational wave detection, particularly focusing on the use of pulsar timing arrays to study cosmic phenomena. Learn about the recent discoveries by NANO-Grav, InPTA, and other PTA collaborations that have provided the first evidence of Stochastic Gravitational Wave Background (SGWB) detection using 15 years of observational data. Understand how these observations connect to fundamental physics beyond the Standard Model, including inflation, Primordial Black Holes, Phase Transitions, and topological defects like cosmic strings and domain walls. Gain insights into how gravitational wave signals can help probe high-scale physics that may be inaccessible through conventional terrestrial or astroparticle physics experiments.
