Strong and Electro-Weak Matter 2026

Session

Early Universe Contributions 1

19 Aug 2026, 11:00

F4050 (4th floor) (University of Helsinki Main Building)

55. Non-Abelian Domain walls

Bowen Fu (Northeastern University, China)

19/08/2026, 11:00

Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves

talk (30min)

Domain walls are two-dimensional topological defects generated when a discrete symmetry is broken during phase transitions in the early universe. The collapse of domain walls can emit gravitational waves that can be observed by interferometers. The simplest and most well-studied domain walls are from $Z_2$ symmetry breaking. However, the breaking of larger non-Abelian discrete symmetries can...

31. Thermoskyrmions

LUIS GIL (Universidad de Granada)

19/08/2026, 11:30

Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves

talk (15min)

Skyrmions were originally proposed in QCD as topological solitons of the pion field, providing an emergent description of baryons without introducing additional degrees of freedom. Their topological nature and possible role as dark matter candidates have since motivated the search for analogous configurations in other theories. A common expectation, however, is that stabilizing skyrmions...

20. ACT-Planck data and phase transitions from a viable no-scale Standard Model completion

Filippo Cutrona (Tor Vergata, INFN)

19/08/2026, 11:45

Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves

talk (15min)

Classically scale-invariant (and perturbative) theories provide a way to understand large hierarchies, as scales are generated through dimensional transmutation. They always lead to first-order phase transitions, since symmetries are radiatively broken, and they generically feature quasi-flat potentials, which are suitable for inflation. I will discuss a simple but fully realistic model of...

80. Baryon number violation from Standard Model Higgs bubble collisions

Nabeen Bhusal (DESY)

19/08/2026, 12:00

Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves

talk (15min)

Baryon number violation at the electroweak (EW) phase transition has typically been associated with thermal sphalerons in the Standard Model (SM). We showed in [2508.21825, to appear in PRL] that B-violation can also occur at zero temperature from a supercooled first-order electroweak phase transition.
In this talk, I will review the work done on B-violation from the production of EW textures...

88. Preheating after a strongly supercooled phase transition in the early Universe

Mateusz Kulejewski (University of Warsaw)

19/08/2026, 12:15

Early universe physics, inflation, electroweak phase transitions, and sources for gravitational waves

talk (15min)

Preheating refers to a well-known set of phenomena, such as tachyonic instability and parametric resonance, associated with the dynamics of a scalar field, typically in the context of post-inflationary reheating. In this talk, I will explore the possibility of preheating-like amplification of fluctuations of a scalar field following a strongly supercooled electroweak first-order phase...