http://cp3.irmp.ucl.ac.be:80/PAI PhTh-FI-ULB Calendar - Week of 10/25/2026 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261026&cal=PhTh-FI-ULB 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 http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261027&cal=PhTh-FI-ULB Tue Oct 27 2026 10:00 AM: Solvay+room http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261028&cal=PhTh-FI-ULB Wed Oct 28 2026 10:00 AM: Solvay+room http://cp3.irmp.ucl.ac.be:80/PAI/day.php?getdate=20261029&cal=PhTh-FI-ULB Thu Oct 29 2026 10:00 AM: Solvay+room