EPT Seminar

Date
Mon, Jan 27, 2020 4:00 pm - 5:30 pm
Location
PSC 3150

Description

Davide Racco, Perimeter Institute

Title: Minimal signatures of the Standard Model in cosmological collider physics


Abstract: The detection of an oscillating pattern in the bispectrum of density perturbations would imply the presence of heavy particles at a scale close to the Hubble rate during inflation. A minimal scenario providing this signature only requires a coupling of SM particles to the inflaton. We focus on the fermions, whose dispersion relation can be modified by the coupling to the inflaton, leading to an enhanced particle production even if their mass during inflation is larger than the Hubble scale.
We study two particularly interesting cases. The detection of the simultaneous contributions of two SM fermions to the bispectrum would allow us to conclude that the Higgs field during inflation resided in a second minimum of its potential located at high scales.
Another remarkable possibility is that the Higgs vacuum during inflation is dynamically set by the contribution of the fermion density to the Higgs potential. This one-parameter model offers a very minimal and predictive signature detectable in cosmological collider physics.

Upcoming Events

22 Jan
LPS Seminar
Date Wed, Jan 22, 2020 2:30 pm - 3:30 pm
27 Jan
JQI Seminar
Date Mon, Jan 27, 2020 11:00 am - 12:00 pm
27 Jan
EPT Seminar
Date Mon, Jan 27, 2020 4:00 pm - 5:30 pm
28 Jan
Physics Colloquium
Date Tue, Jan 28, 2020 4:00 pm - 5:00 pm
30 Jan
QMC COLLOQUIUM: Cagliyan Kurdak, University of Michigan
Date Thu, Jan 30, 2020 2:00 pm - 3:00 pm