DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS 2026

    • Tuesday 13 October 2026 at 10:15 in A315 and using Zoom: Juan Pablo Garcés (Heidelberg)
      Asymmetry Sequestering in the Early Universe
      Abstract:       In this seminar, I will present different ways in which “asymmetry sequestering” can be used to explain the matter-antimatter asymmetry of the Universe. After reviewing the necessary ingredients for baryogenesis and the working principle of the sequestering mechanism behind Dirac leptogenesis, I will proceed to tell a four-chapter story. First, we will explore the possibility that our asymmetric Universe originated from the dynamics of a smooth reheating period. Next, we will move beyond the smoothness assumption and see how nonlinear dynamics during preheating can generate an asymmetry, as studied through lattice simulations. In the third chapter, we will see how the “rules of the game” change when replacing some renormalizable operators with higher-dimensional ones. Finally, we’ll ask the question that often comes up in a cosmology seminar: what about dark matter?
    • Tuesday 20 October 2026 at 10:15 in A315 and using Zoom: Roman Zwicky (Edinburgh)
      TBA
      Abstract:       TBA
    • Thursday 22 October 2026 at 10:15 in A315 and using Zoom: Matti Heikinheimo (Helsinki)
      The LZ high energy recoil event and possible dark matter explanations for it
      Abstract: The Lux-Zeplin experiment has observed a single event in a high recoil energy search, with characteristics matching a nuclear recoil of 248 keV. Such an event is not expected from any known backgrounds. I will discuss some dark matter models proposed in the literature that could explain the observation while avoiding a large number of expected events in the low energy region, where none are observed. Among those is light dark matter that interacts with the SM via spin and momentum dependent interactions, where the high energy recoil is due to a high velocity component of the DM flux, arising via scattering with energetic cosmic rays.
    • Tuesday 27 October 2026 at 10:15 in A315 and using Zoom: Débora Mroczek (Turku)
      TBA
      Abstract:       TBA
    • Tuesday 3 November 2026 at 10:15 in A315 and using Zoom: Antti Hippeläinen (Helsinki)
      TBA
      Abstract:       TBA

Hopefully the up to 50 min + 10 min discussion long seminar/colloquium will be understandable to a wide audience.
Contacts: Keijo Kajantie (keijo kajantie at helsinki fi) [ HIP seminar],
Tushar Gupta  (tushar.gupta at helsinki fi) [cosmo seminar]

Other related seminars

Friday 10-12 seminar series in D114: Astrophysics seminar
Mathematical Physics Seminar and Workshop series Wed 14-16 in Exactum C123.
InstituteQ Events and Seminars