BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Andreas Mantziris (Universidade do Porto) DTSTART:20250520T090000Z DTEND:20250520T100000Z DTSTAMP:20260423T024827Z UID:NKUA-HEP/37 DESCRIPTION:Title: Gravitational waves from a curvature-induced phase transition of a Higgs -portal dark matter sector\nby Andreas Mantziris (Universidade do Port o) as part of NKUA HEP Seminars\n\n\nAbstract\nOur latest study (2407.1884 5) investigates the possibility of generating gravitational waves (GWs) fr om a curvature-induced phase transition of a non-minimally coupled scalar field acting as dark matter\, with a portal interaction to the Higgs field . This analysis is conducted within a dynamical spacetime framework\, spec ifically during the transition from inflation to kination\, while also exa mining the potential for triggering Electroweak symmetry breaking through this mechanism.\n\nA comprehensive exploration of inflationary scales is c arried out\, considering both positive and negative values of the non-mini mal coupling. The study further accounts for phenomenological and observat ional constraints on the Beyond Standard Model (BSM) couplings\, ensuring consistency when the scalar field serves as spectator dark matter. Notably \, kination enhances the GW amplitudes\, significantly restricting the via ble parameter space. While the resulting GW spectra typically reside at hi gh frequencies for standard high-scale inflation\, certain regions of para meter space allow for potential detection in future experiments\, offering a testable link between early universe dynamics\, dark matter physics\, a nd gravitational wave cosmology.\n LOCATION:https://researchseminars.org/talk/NKUA-HEP/37/ END:VEVENT END:VCALENDAR