Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 54: Higgs Physics VI
T 54.2: Talk
Wednesday, March 18, 2026, 16:30–16:45, KH 01.019
Strong First-Order Phase Transitions and Exotic Phases in the CP-Conserving 2HDM — Lisa Biermann1, •Christoph Borschensky2, Rafael Boto2, Margarete Mühlleitner2, Rui Santos3,4, and João Viana3 — 1PSI Center for Neutron and Muon Sciences, Villigen, Switzerland — 2Karlsruher Institut für Technologie, Germany — 3Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, Portugal — 4Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Portugal
Extended scalar sectors can significantly influence the cosmological evolution of the early universe. The additional scalar degrees of freedom allow for strong first-order phase transitions (SFOPT) into the electroweak-broken vacuum, which induce gravitational waves that, for sufficiently strong signals, might be detectable in the near future. Additionally, the universe might have undergone exotic intermediate phases such as charge-breaking or CP-violating phases via a multi-step phase transition.
In this talk, the parameter space of the CP-conserving 2-Higgs-Doublet Model is investigated with the recent version 3 of the public code BSMPT. Within this model, we study the viability of SFOPTs in light of the recent experimental data from Higgs measurements and exotic Higgs searches. We present points involving different one- and multi-step phase histories, and study their features such as the size of the trilinear Higgs couplings as well as the strength of their gravitational wave signals.
Keywords: Electroweak phase transitions; Higgs physics; Beyond the Standard Model; Two Higgs Doublet Model; Gravitational waves