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Colloquia
The Higgs: A Window on New Physics and the Early Universe
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Europe/Paris
Amphitheatre Pierre-Gilles de Gennes (APC)
Amphitheatre Pierre-Gilles de Gennes
APC
Description
Abstract
The discovery of the Higgs boson completed the particle content of the Standard Model (SM), but fundamental questions remain unanswered: What is dark matter? Why is our Universe dominated by matter rather than antimatter? The Higgs may provide a unique connection between these questions and physics at the energy frontier.
In many theories beyond the SM, the Higgs sector is extended, leading not only to new particles and deviations in Higgs properties, but also to a very different history of the early Universe. A particularly intriguing possibility is a first-order electroweak phase transition, which could have shaped the evolution of the early Universe and left observable signatures that we can search for today.
In this colloquium, I will use electroweak baryogenesis as an example to illustrate how Higgs physics can connect particle physics with cosmology. I will discuss how the underlying new physics can be explored through complementary probes, ranging from collider and electric-dipole-moment experiments to gravitational waves and even primordial black holes. Together, these complementary observations may allow us to use the Higgs as a probe of the thermal history of the early Universe.
About the speaker
Shinya Kanemura is a professor at the University of Osaka, Japan. He received his Ph.D. from the U. of Osaka in 1996 and subsequently held research positions at KEK, Karlsruhe Institute of Technology, Michigan State University, the U. of Osaka, and the U. of Toyama. In 2017, he returned to the U. of Osaka as a full professor. His main research field is particle phenomenology, with particular emphasis on extended Higgs sectors and their connections to physics beyond the Standard Model. He has also worked on various models addressing the origin of neutrino masses, dark matter, and the baryon asymmetry of the Universe, as well as their phenomenological implications.