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| Description | Speaker: Ken Van Tilburg (NYU) Title: Stellar Basins of Gravitationally Bound Particles Host: Zoom: https://zoom.us/j/186024391 Abstract: I will describe and explore the consequences of a newly identified physical phenomenon: volumetric stellar emission into gravitationally bound orbits of weakly coupled particles such as axions, moduli, hidden photons, and neutrinos. While only a tiny fraction of the instantaneous luminosity of a star (the vast majority of the emission is into relativistic modes), the continual injection of these particles into a small part of phase space causes them to accumulate over astrophysically long time scales, forming what I call a "stellar basin", in analogy with the geologic kind. The energy density of the Solar basin can surpass that of the relativistic Solar flux at Earth's location after only a million years, for any sufficiently long-lived particle produced through an emission process whose matrix elements are unsuppressed at low momentum. This observation has immediate and striking consequences for direct detection experiments---including new limits on axion and hidden-photon parameter space independent of dark matter assumptions---and may also increase the prospects for indirect detection of weakly interacting particles around stars. [Based on https://arxiv.org/abs/2006.12431 and https://arxiv.org/abs/2008.08594.] |
| Date | Mon, September 21, 2020 |
| Time | 4:10pm-5:10pm PDT |
| Duration | 1 hour |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Thu, September 17, 2020 6:35pm PDT |
| Send Reminder | Yes - 0 days 8 hour 0 minutes before start |
