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    Strong and Electro-Weak Matter 2026

    17–21 Aug 2026
    University of Helsinki Main Building
    Europe/Helsinki timezone

    Contact

    Session

    Early Universe Contributions 3

    20 Aug 2026, 11:00
    F4050 (4th floor) (University of Helsinki Main Building)

    F4050 (4th floor)

    University of Helsinki Main Building

    University of Helsinki Fabianinkatu 33 Finland

    Conveners

    Early Universe Contributions 3

    • Mark Hindmarsh (University of Helsinki, University of Sussex)

    Presentation materials

    There are no materials yet.

    1. 72. Thermal nucleation in perturbation theory
      Joonas Hirvonen (University of Nottingham)
      20/08/2026, 11:00
      Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves
      talk (30min)

      Cosmological first-order phase transitions may have generated a gravitational wave background detectable by LISA, offering a unique window into physics beyond the Standard Model. A crucial step in predicting this background is the reliable computation of bubble nucleation rates. In this talk, we overview the current state of perturbative calculations based on effective field theories and...

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    2. 33. Bubble wall velocity from entropy production
      Dr Benoit Laurent (Perimeter Institute)
      20/08/2026, 11:30
      Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves
      talk (30min)

      Cosmological first-order phase transitions are of great phenomenological interest: they can generate a detectable stochastic gravitational wave background, source the baryon asymmetry of the Universe, and seed primordial magnetic fields. A key parameter governing all of these phenomena is the bubble wall velocity $v_w$, which controls the efficiency of each process.

      Computing $v_w$ from...

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    3. 73. Nucleation in supercooled cosmological phase transitions
      Maciej Kierkla (Uppsala University)
      20/08/2026, 12:00
      Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves
      talk (15min)

      I will present an overview of the calculation of the thermal bubble nucleation rate in the context of supercooled cosmological phase transitions. Focusing on the case of “gauge+Higgs” theories, I will discuss the framework of “high-temperature dimensional reduction”. This perturbative approach can be understood as an effective field theory (EFT) at finite temperature. I will present...

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    4. 120. Cold electroweak baryogenesis on the lattice: An update
      Martina Cataldi (University of Hamburg)
      20/08/2026, 12:15
      Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves
      talk (15min)

      Baryon number can be efficiently violated at low temperatures, from Higgs bubble collisions in a strongly first-order electroweak phase transition, based on the dynamics of electroweak textures [2508.21825]. This may open up new possibilities of realizing electroweak baryogenesis in models with a low reheat temperature and large bubble wall velocity.
      In this talk, I will propose a novel...

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