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Events on Tuesday, December 6th, 2022

Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
Gravitational-wave signatures of dense matter in neutron star binary inspirals
Time: 2:00 pm
Place: Join Zoom Meeting Meeting ID: 912 3071 4547
Speaker: Tanja Hinderer , Institute for Theoretical Physics, Utrecht University
Abstract: The gravitational waves from merging binary systems carry unique information about the internal structure of neutron stars. Extracting and interpreting this information requires accurate models based on a detailed understanding of the interplay of matter with nonlinear gravity. I will outline recent progress on going beyond the dominant tidal deformability effects and discuss examples of the impact of incorporating more realistic physics. I will conclude with an outlook onto the remaining challenges and prospects for the coming years, as gravitational-wave science continues to move towards an era of precision physics.

Host: Baha Balantekin
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Theory Seminar (High Energy/Cosmology)
Electroweak Symmetric Balls
Time: 4:00 pm - 5:00 pm
Place: Chamberlin 5280
Speaker: Mrunal Prashant Korwar, UW Madison
Abstract: Electroweak symmetric balls are macroscopic objects with electroweak symmetry restored inside. Such an object can arise in models where dark sectors contain monopole or non-topological soliton with a Higgs portal interaction to the Standard Model. It could be produced in the early universe via phase transition or preheating mechanism, accounting for all dark matter. In a scenario where the balls are allowed to evaporate, the observed baryon asymmetry in our universe could be explained by a mechanism of “catalyzed baryogenesis.” In this mechanism, the motion of a ball-like catalyst provides the necessary out-of-equilibrium condition, its outer wall has CP-violating interactions with the Standard Model particles, and its interior has baryon number violating interactions via electroweak Sphaleron. Because of electroweak symmetric cores, such objects have a large geometric cross-section off a nucleus, generating a multi-hit signature in large-volume detectors. These objects could radiatively capture a nucleus and release GeV-scale energy for each interaction. The IceCube detector can probe dark matter balls with masses up to a gram.
Host: George Wojcik
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