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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)

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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)

-- Abstract: In this talk I will discuss aspects of microscopic degrees of freedom of gravity as motivated by string theory. Although these are expected to be generically quantum mechanical, our goal is to understand a class of such states that are coherent enough to admit classical descriptions in Einstein gravity. The construction of such states corresponds to adding interesting topological structures in spacetime with the help of compact extra dimensions. They manifestly behave as ultra-compact objects, dubbed topological stars, which can also model black hole microstates. I will discuss why it is interesting to understand such objects in a new age of black hole astrophysics.

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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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