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T: Fachverband Teilchenphysik

T 51: BSM physics (theory)

T 51.10: Vortrag

Mittwoch, 17. März 2021, 18:15–18:30, Ta

Gravitational waves from collapsing domain walls in a 2HDM + complex singlet — •Luis Hellmich — DESY, Hamburg, Germany

I investigate the possibility of domain wall formation in a 2HDM + complex singlet with a discrete Z₂- and an additional Z₃-symmetry. Spontaneous breaking of the discrete symmetries at the elctroweak phase transition leads to the formation of domain walls, which may collapse sufficiently fast, if there exists a bias term in the potential to break the symmetries explicitly. The gravitational waves (GW) produced by these collapsing domain walls are analyzed, taking into account a combination of constraining collider and cosmological data. The resulting GW spectra are compared to limits of current and future GW detectors.