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Explore a 32-minute physics lecture examining how stochastic gravitational waves can probe early universe cosmology, delivered by Professor Anson Hook from the University of Maryland at Harvard CMSA. Learn about the potential of using the causal tail of stochastic gravitational waves to measure the energy density in free streaming relativistic species and determine gstar and beta functions across different temperatures. Discover how the LISA detector could measure the universe's free streaming fraction with unprecedented sensitivity, potentially testing theories like split SUSY and solutions to the Electroweak Hierarchy problem. Examine how future detectors such as DECIGO could offer even greater sensitivity for testing scenarios involving WIMPs and axions, while understanding the importance of precise gravitational wave measurements in validating theoretical physics models.
