# Beyond General Relativity, Beyond Cosmological Standard Model

1-5 July 2019
Faculty of Physics, University of Warsaw
Europe/Warsaw timezone

## Nonthermal dark matter from modified early matter domination

Not scheduled
20m
Faculty of Physics, University of Warsaw

#### Faculty of Physics, University of Warsaw

conference hall 0.03, Faculty of Physics, University of Warsaw ul. Pasteura 5, 02-093 Warszawa Poland
Poster session

### Speaker

Jacek Osinski (University of New Mexico)

### Description

Thermal freeze-out or freeze-in during a period of early matter domination can give rise to the correct dark matter abundance for an annihilation rate of $\big<\sigma_{ann}v\big>_f < 3 \times 10^{−26} {\rm cm}^3 {\rm s}^{−1}$. In the standard scenario, a single field that behaves like matter drives the early matter dominated era and decays to radiation before big bang nucleosynthesis. However, in more realistic models, this epoch may involve more than one field which can result in a complex thermal history. As a simple extension to the standard scenario, we will consider dark matter production via freeze-in/out in the presence of two fields and demonstrate that the allowed parameter space to obtain the correct dark matter abundance can be significantly enlarged to accommodate a wide range of dark matter masses and annihilation rates. In doing so, we will also consider the onset of early matter domination and the effects of a period of either matter or radiation domination preceding a single-field scenario.

arXiv:1812.10522 [hep-ph]
R. Allahverdi and J. Osinski 2019 in preparation

### Primary authors

Jacek Osinski (University of New Mexico) Rouzbeh Allahverdi (University of New Mexico)

### Presentation Materials

There are no materials yet.