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, Grad Pheno Journal Club (2:00 PM - 3:00 PM)

Cristiano Germani, Primordial black holes: formation and statistics (2:00 PM - 3:15 PM)

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Katie Breivik, Binary Evolution: a Multi-messenger, Multi-band Puzzle (2:00 PM - 3:00 PM)

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Julio Parra-Martinez, Causality constraints on gravitational effective theories (2:00 PM - 3:00 PM)

-- Abstract: I will describe constraints from causality and unitarity on 2→2 graviton scattering in weakly-coupled gravitational effective field theories. Together, causality and unitarity imply dispersion relations that connect low-energy observables to high-energy data. Using such dispersion relations, we can derive two-sided bounds on gravitational Wilson coefficients in terms of the mass M of new higher-spin states. Our bounds imply that gravitational interactions must shut off uniformly in the limit G→0, and prove the scaling with M expected from dimensional analysis. In addition they demonstrate the gravity must be weakly coupled at all scales below Planck and that gravitational EFTs with a large number of light fields must have a low cutoff.

Sasha Tchekhovskoy, Simulating Black Hole Feasts, Burps, Fireworks, and Gravitational Waves (2:00 PM - 3:15 PM)

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Ibrahima Bah, Topological stars in gravity (2:00 PM - 3:00 PM)

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Robert Cava, Working at the boundary where Solid State Chemistry, Mineralogy and Materials Science Meet Materials Physics (4:00 PM - 5:30 PM)

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