Thursday, April 30, 2025, 16:00
WBGB/019
Thomas Biekötter, IFT Madrid
Abstract:
The observed matter-antimatter asymmetry of the universe remains
one of the deepest puzzles in fundamental physics. Electroweak
baryogenesis offers an elegant solution, requiring new CP-violating
interactions and a strong first-order electroweak phase transition,
both of which leave measurable imprints across a range of
experiments. Extended Higgs sectors play a central role: they
can simultaneously modify the nature of the electroweak phase
transition, predict additional scalar particles searchable at
the LHC and accommodate new sources of CP-violation. A strong
electroweak phase transition moreover generates a stochastic
primordial gravitational-wave background that is potentially
within reach of space-based gravitational-wave detectors such as
LISA. I will show how combining LHC Higgs data, EDM constraints,
and gravitational-wave projections allows one to build realistic
assessments of the viability of electroweak baryogenesis, and how
the complementarity between these three experimental frontiers
will be essential to determining whether the electroweak phase
transition holds the key to the origin of matter.