12th Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY 2026)

Session

Contributed 4

20 Aug 2026, 10:30

Commodore Hotel

9. Boiling down Neutrinos: Cosmological First-Order Phase Transitions in Radiative Mass Models

Francesco Paolo Di Meglio (IFIC (UV-CSIC))

20/08/2026, 10:30

Parallel talks: 17'+3'

Symmetries are the daily bread of modern particle physicists. In a variety of scenarios their breaking is associated with the formation and expansion of bubbles of true vacuum in what is called a first order phase transition. In this context, Electroweak Baryogenesis, a mechanism proposed over 40 years ago, takes advantage of Electroweak symmetry breaking and offers a way to address the baryon...

45. Primordial Black Hole Hotspots Beyond Flat Spacetime

Jong-Hyun Yoon (Chungnam National University)

20/08/2026, 10:50

Parallel talks: 17'+3'

Evaporating primordial black holes heat the surrounding plasma via Hawking radiation, forming localized hotspots whose temperature may far exceed that of the cosmological background. Previous studies of hotspot formation and cooling have treated the subsequent energy transport in flat spacetime, thereby neglecting the expansion of the Universe. We formulate the diffusion equation governing the...

3. Impact of first-order phase transition on dark matter relic

Partha Kumar Paul (Indian Institute of Technology Hyderabad)

20/08/2026, 11:10

Parallel talks: 17'+3'

We propose a simple yet testable framework for light fermion dark matter (DM) with mass in the MeV--GeV range, charged under a dark $U(1)_D$ gauge symmetry. Before symmetry breaking, DM annihilates excessively into massless dark gauge bosons, resulting in an under-abundant relic and hence creating severe tension with cosmic microwave background (CMB) and indirect detection constraints. This is...