## Cosmological Simulations of structure formation

Our simulation suite currently consists of:

- a set of dark matter only high-resolution boxes: of (25 Mpc)^3 cubic volume with 752^3 baryon particles and 752^3 DM particles, reaching a spatial resolution of 350 pc.

- a hydrodynamical suite of (25 Mpc)^3 cubic volume with 376^3 baryon particles and 376^3 DM particles, reaching a spatial resolution of 752 pc.

The simulations have been re-run starting from the same initial conditions, but assuming different self-interacting dark matter flavours. These include constant cross section of 0 (CDM case), 1 cm^2/g and 10 cm^2/g, as well as velocity dependent models (as shown in figure on the right).

## Dark Matter Particle-Particle collisions in SWIFT

We have modelled the interaction between dark matter (DM) particles following a stochastic approach, where DM particles have a probability of interaction that depends on the cross section, σ/m, as well as on the distance and relative velocity between them. The search radius, which encloses a region where a DM particle has the probability of interacting with its neighbours, is not constant, instead it is adjusted according to the local density.

# Meet the Team

**Camila Correa (PI)**

Veni Fellow at the University of Amsterdam

**Matthieu Schaller**

Lecturer at Leiden University, lead developer of the galaxy formation code SWIFT

**Sylvia Ploeckinger**

Postdoctoral fellow at Leiden University

**Noemi Anau Montel**

PhD Student at the University of Amsterdam

**Weniger Christoph**

A/Prof. at the University of Amsterdam

**Shinichiro Ando**

A/Prof. at the University of Amsterdam