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Events on Tuesday, September 27th, 2022

Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
Distribution Functions of Dark Matter Halos
Time: 2:00 pm
Place: Join Zoom Meeting Meeting ID: 912 3071 4547
Speaker: Axel Gross , University of Minnesota
Abstract: The spherical NFW profile provides a good approximation to the density distributions of dark matter halos. In dynamical equilibrium, this density profile should correspond to a stationary distribution function of dark matter in phase space. We derive this distribution function and show that it is a good match to those obtained from N-body simulations.

Host: Baha Balantekin

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Meeting ID: 912 3071 4547
Host: A. Baha Balantekin
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Theory Seminar (High Energy/Cosmology)
Coupling a Cosmic String to a TQFT
Time: 4:00 pm - 5:00 pm
Place: Chamberlin 5280
Speaker: Sungwoo Hong, (Argonne, U. Chicago)
Abstract: In the last few years, the notion of symmetry has been enlarged to "generalized symmetry" and these more generalized symmetries have played a critical role in deepening our understanding of QFT, notably IR phases of QFT. In this talk, I will discuss various ways of coupling the axion-Maxwell theory to a sector of topological field theory (TQFT). Contrary to common wisdom, I will show that such topological modifications can lead to direct changes in the local physics with possible observable consequences. This surprise can be realized by a dimensional reduction, namely, a coupling to a TQFT in 4d leads to a non-trivial and local impact on the 2d string world-sheet QFT. I will explain how this happens using the language of anomaly inflow, which provides a way of figuring out the IR-universal observable effect from the TQFT-coupling. There exists another topological modification of the theory, i.e. gauging a discrete subgroup of 0-form shift symmetry, and this time it results in an alteration of the spectrum of cosmic strings. If time permits, I will also discuss generalized symmetries and associated higher-groups of these theories.
Host: George Wojcik
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