| Saturday 21 December 2024 | |
| Events for day: Tuesday 01 February 2022 |
| 14:00 - 15:00 Weekly Seminar HEPCo Group Primordial Black Holes from Non-Perturbative Tails School PHYSICS Date and time Tuesday, 1st of February, 2022 (12th of Bahman, 1400), 2:00 pm (Tehran zone) Link https://us02web.zoom.us/j/86984492174?pwd=QmozNTlZRnJLb3pKb0lpNlhwSjFwQT09 Meeting ID: 869 8449 2174 Passcode: 662580 Abstract Primordial black holes (PBHs) may comprise a significant fraction of dark matter and may also be a possible source for some of the detected gravitational waves. One of the formation mechanisms of PBHs is due to the large fluctuations generated during inflation. The perturbative methods are no longer valid for calculating the statistics of the ... 16:30 - 18:30 Number Theory Webinar Totally Singular Algebraic Groups School MATHEMATICS I will define the groups of the title and discuss some examples. When they are of positive dimension, these groups exist only over an imperfect field. We will see examples in dimension 1 related to the purely inseparable forms of the additive group studied by Russell in 1970. We will also see some examples of arbitrarily high dimensions. I hope to convince the audience that this class of algebraic groups is both interesting and quite large! Zoom link: https://us06web.zoom.us/j/9086116889?pwd=WGRFOGZWZ1FOMXJrcWpJMWFqUFIvQT09 Meeting ID: 908 611 6889 Passcode: 362880 ... 17:00 - 18:00 IPM Holography virtual seminar Flat JT Gravity and the BMS-Schwarzian School PARTICLES AND ACCELERATORS Abstract: We consider Minkowskian Jackiw-Teitelboim (JT) gravity in Bondi gauge at finite temperature, with non-zero vacuum energy. Its asymptotic symmetries span an extension of the warped Virasoro group, dubbed "BMS_2". The BMS-Schwarzian coadjoint action coincides with the boundary action functional of flat JT gravity up to a dilatonic zero-mode that ensures the existence of a well-defined bulk variational principle. We then evaluate the flat JT gravitational partition function, which turns out to be one-loop exact. (for participating in this event, please contact us: "particles@ipm.ir") |