| Speaker: | Mateja Gonseca (University of Vienna) |
|---|---|
| Title: | Multifield ultralight dark matter |
| Date (JST): | Thu, Jul 25, 2024, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: |
The ultralight dark matter (ULDM) model presents one of the most compelling alternatives to cold dark matter due to the wave interference effects which are potentially observable on cosmological scales. In the simplest ULDM scenario, dark matter is described by a single scalar field with a characteristic de Broglie wavelength scale which depends on the mass of the corresponding dark matter particle. This is manifested as dark matter halos having a central soliton, surrounded by order-one granular fluctuations. In its simplest form and for the lightest particle masses which display wave effects on the largest scales, this model is by now tightly constrained by observations. However, extensions involving more than one field or even self interactions have the possibility to relax these constraints. Due to the non-linear nature of the Schrödinger-Poisson system, this has to be explored with numerical simulations. In my talk, I will present results from simulations involving multiple fields or mixed scenarios. In particular, I will show that dark matter halos composed of more fields are smoother which has important implications for observable phenomena. |
