| Speaker: | Ayuki Kamada (University of Warsaw) |
|---|---|
| Title: | Self-interacting dark matter: non-perturbative dynamics |
| Date (JST): | Wed, Jun 17, 2026, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: |
Strongly self-interacting dark matter (SIDM) leads to gravothermal collapse of DM halos. This possibility is not just intriguing, but may also explain astronomical observations: such as diverse mass distributions of Milky-Way satellite galaxies; and seeds of massive black holes at high redshifts. To expedite gravothermal collapse further, not just elastic scattering of DM particles via exchange of a light mediator but also dissipative scattering via emission of the light mediator has attracting growing interests. It is known that in a vast parameter space, elastic scattering cannot be computed perturbatively (Born approximation is not valid even if underlying relativistic theory is perturbative). In this talk, after reviewing non-perturbative computation of elastic scattering, we introduce non-perturbative computation of dissipative scattering to discuss at which parameter space Born approximation is (not) valid. |
