Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 36: Higgs Boson: Extended Models 1
T 36.9: Vortrag
Dienstag, 22. März 2022, 18:15–18:30, T-H21
Impact of the different discrete symmetries in the 2HDM and N2HDM on Domain Wall formation and its phenomenological implications — •Luis Hellmich1 and Gudrid Moortgat-Pick1,2 — 1Universität Hamburg, Hamburg, Deutschland — 2DESY, Hamburg
Domain wall formation is a consequence of spontaneously broken discrete symmetries. Stable domain walls are cosmological bad news as they are expected to dominate the energy density of the universe. One way to overcome this domain wall problem are energetically biased vacua, which can render domain walls unstable.
In the 2HDM and N2HDM a discrete Z2 symmetry is usually present in order to avoid FCNCs, which is softly broken and hence can produce collapsing domain walls. We find that in the Type I 2HDM and N2HDM there is an additional inherent and not explicitly broken Z2 symmetry. Furthermore the N2HDM also exhibits the well-known only spontaneously broken Z2′ symmetry. We want to discuss the impact of those different discrete symmetries on domain wall formation. In particular we want to show how stable domain walls for the unbroken discrete symmetries may be suppressed and analyze the phenomenological consequences when applying the resulting constraints on the 2HDM and N2HDM.