Events Daily

Friday, October 6, 2023

Numerical studies of turbulence in Supernova Remnants using expanding mesh hydrodynamics
Soham Mandal, Purdue University
Event Type: Informal Astro Talk
Time: 9:30 AM - 10:00 AM
Location: 726 Broadway, 901, Sm Conf
Abstract: Turbulent activity in supernova remnants (SNRs) expanding against their surroundings gives rise to structures that may be related to small scale anisotropies seen in many remnants, such as Tycho’s SNR, SN 1006, Kepler's SNR etc. We study this with a suite of 3D hydrodynamical models developed using my novel hydro code Sprout, which solves hydro equations on an expanding Cartesian mesh. This provides high dynamic range for many orders of magnitude of expansion with little numerical diffusion, capturing shocks and fine structures accurately. I will show that small scale anisotropies in SNRs provide a direct diagnostic of the density profile of the progenitor. I also argue that inhomogeneities in the ejecta or the surrounding medium do not leave an imprint on the turbulent activity in the remnant, unless they have a very large amplitude and form large-scale coherent structures.

Postdoc HepTh Discussion Group
Event Type: ArXiv Discussion
Time: 12:00 PM - 1:30 PM
Location: 726 Broadway, 902, Lg Conf

A supersymmetric SYK model with a curious low energy behavior
Vladimir Narovlansky, Princeton University
Event Type: Informal HEP Talk
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: We describe a supersymmetric SYK model with interesting low energy dynamics. The equations of this model generalize equations that appeared previously as an uncontrolled truncation of the BFSS model, but describe correctly the large N limit of the SYK theory. The entropy at low energies has a non-trivial scaling with temperature, and additionally there are unusual low temperature features in this model that we will discuss. We study the possibility of a spin glass phase which has been suggested in the past.