http://cp3.irmp.ucl.ac.be:80/PAI BEL-center:pheno Calendar - Week of 10/25/2026 en Copyright 2026, 65tjgjrqmpdtv24bjilhtkgpi0@google.com 2:00 PM http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261026&cal=BEL-center_pheno Mon Oct 26 2026 2:00 PM: <b>Dark matter from phase transitions - phase transitions from dark matter</b>I will present the intriguing interplay between cosmological phase transitions and the out-of-equilibrium production of dark matter. If dark matter is produced non-thermally via non-renormalisable interactions (so-called UV-dominated freeze-in), the resulting abundance depends sensitively on the entire cosmological history. In particular, it can be strongly affected by cosmological first-order phase transition, after which the decaying scalar field transfers its energy density to the SM radiation and dilutes pre-existing particle abundances. I will discuss how this phase-in mechanism introduces a dependence of the final DM abundance on the details of the phase transition, in particular the subsequent equation of state of the universe. Using results from lattice simulations, I will show that the collision of highly-relativistic bubble walls leads to an equation of state that may differ significantly fro