Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 72: BSM Higgs 3 (extended Higgs sectors)
T 72.1: Talk
Wednesday, March 6, 2024, 16:00–16:15, Geb. 30.41: HS 3
Domain Walls in the N2HDM: Exploring Vacuum Trapping and Scalar Potential Evolution — •Rohan Gupta1, Gudrid Moortgat-Pick1,2, and Mohamed Younes Sassi1,2 — 1Universität Hamburg, Germany — 2DESY, Hamburg, Germany
In various Beyond the Standard Model (BSM) theories, the scalar sector is extended with additional scalar doublets and singlets. Consequently, the scalar potential of the theory becomes significantly more intricate than that of the Standard Model and leads to the possibility of having new phenomena such as Vacuum Trapping, where the vacuum expectation values (VEV) of the doublet scalar fields remain zero, despite the non-zero VEVs at the global minimum of the theory. The universe is then trapped in the symmetric phase and electroweak symmetry breaking does not occur, rendering the parameter points, that exhibit this phenomenon, as unphysical. This study specifically explores the occurrence of vacuum trapping in the N2HDM, an extension of the Standard Model's scalar sector that includes an additional doublet and a singlet scalar. Due to the breaking of a discrete symmetry related to the singlet, this model leads to the formation of domain walls in the early universe. We discuss the possibility of preventing vacuum trapping, particularly in cases where tunneling to the electroweak vacuum occurs within the domain wall structure.
Keywords: Domain Walls; Vacuum Trapping; N2HDM; ElectroWeak Symmetry Breaking; Scalar Potential