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23–26 Sept 2025
DESY Hamburg
Europe/Berlin timezone

Electroweak phase transition seeded by DFSZ axion string

24 Sept 2025, 14:18
18m
Bldg. 1b, seminar room 4a (DESY)

Bldg. 1b, seminar room 4a

DESY

Cosmology & Astroparticle Physics Parallel Sessions Wednesday Cosmo

Speaker

Dr Yu Hamada (T (Cosmo))

Description

We study the possibility that axion strings in the DFSZ model can act as seeds for the electroweak(EW) first-order phase transition. Unlike the KSVZ case, the DFSZ axion strings can couple to the Higgs sector via a "axion-dependent" portal interaction. We analyze the resulting effective theory and find that string-induced EW bubbles have a different feature from usual bubbles or string-seeded bubbles in KSVZ model. In particular, the profile of the bubble is neither spherically symmetric nor axially symmetric. We study the expansion of this bubble and discuss its cosmological implication.

Primary authors

Simone Blasi (T (Cosmology)) Dr Yu Hamada (T (Cosmo))

Presentation materials