December 2024 |
Monday | Tuesday | Wednesday | Thursday | Friday |
2 Chris Dessert, Cosmic Axiverse Background (12:30 PM - 1:30 PM) , Astro Journal Club (2:00 PM - 3:15 PM) | 3 Caio Nascimento, The speed of sound in the EFTofLSS (11:00 AM - 12:15 PM) + Abstract: Ravi Sheth, Back to the future: Reconstructing initial conditions from galaxy surveys (2:00 PM - 3:15 PM) + Abstract: | 4 , HEP Journal Club (12:30 PM - 1:45 PM) Peizhi Du, Dark Radiation Isocurvature from Cosmological Phase Transitions (2:00 PM - 3:15 PM) + Abstract: | 5 Hogg/Blanton (2:00 PM - 3:45 PM) , Pullen Group Meeting (3:00 PM - 4:00 PM) | 6 Andrea Ghez (3:00 PM - 6:00 PM) Q. Weller and M. Calkins (4:30 PM - 6:00 PM) |
9 Anna Suliga, Non-conservation of Lepton Numbers in the Neutrino Sector Could Change the Prospects for Core Collapse Supernova Explosions (12:30 PM - 1:30 PM) , Astro Journal Club (2:00 PM - 3:15 PM) | 10 David Hogg et. al, Machine Learning Chalk Talk (11:00 AM - 12:15 PM) + Abstract: Keith Hawkins, Galactic Archaeology in the Gaia Era (2:00 PM - 3:15 PM) + Abstract: | 11 , HEP Journal Club (12:30 PM - 1:45 PM) Nathaniel Craig, Broken higher-form symmetries in particle physics (2:00 PM - 3:15 PM) + Abstract: | 12 Amir Levinson, Fast radio bursts, monster shocks and chaos (2:00 PM - 3:00 PM) -- Abstract: It has been proposed recently that the breaking of MHD waves in the inner magnetosphere of strongly magnetized neutron stars can power different types of high-energy transients. In the first part of this talk, I’ll present recent results of PIC simulations of monster shocks that, for the first time, reveal the generation of a high-frequency precursor wave at the foot of the shock, carrying a fraction of 0.001 of the total energy dissipated in the shock. The spectrum of the precursor wave exhibits several sharp harmonic peaks, with frequencies in the GHz band under conditions anticipated in magnetars. Such signals may appear as fast radio bursts. In the second part, I’ll describe an analytic solution that reproduces the results of our PIC simulations, as well as other simulations of magnetized shocks, and show that dissipation in such shocks does not require collective plasma effects. Rather, dissipation and thermalization in such shocks relies on the onset of chaos in orbital dynamics within quasiperiodic solitary structures, as quantified by the spectrum of Lyapunov exponents. Hogg/Blanton (2:00 PM - 3:45 PM) , Pullen Group Meeting (3:00 PM - 4:00 PM) Vincenzo Vitelli, Learning and Active Mechanics (4:00 PM - 5:30 PM) + Abstract: | 13 , Holiday Party (3:30 PM - 5:30 PM) Q. Weller and M. Calkins (4:30 PM - 6:00 PM) |
16 | 17 | 18 Giovaneti, CU*IP (4:00 PM - 6:00 PM) | 19 | 20 |
23 , Holiday Recess; University Closed | 24 , Holiday Recess; University Closed | 25 , Holiday Recess; University Closed | 26 , Holiday Recess; University Closed | 27 , Holiday Recess; University Closed |
30 , Holiday Recess; University Closed | 31 , Holiday Recess; University Closed | 1 , Holiday Recess; University Closed | 2 | 3 |