TH BSM Forum

# Higgs inflation, unitarity, and emergence of scalaron

## by Yohei Ema (Deutsches Elektronen-Synchrotron DESY)

Europe/Zurich
4/3-006 - TH Conference Room (CERN)

### 4/3-006 - TH Conference Room

#### CERN

100
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Description

Higgs inflation introduces a large non-minimal coupling between the Ricci scalar and Higgs that makes the cut-off scale well below the Planck scale. In the first part of the talk, we show that unitarity is indeed violated by a resonant production of longitudinal gauge bosons after inflation, calling for UV completion of Higgs inflation. We then show that unitarity is restored after summing over vacuum polarization-type diagrams that are leading-order in the large-N limit. Scattering amplitude develops a pole after the resummation, which we identify as the scalar component of the metric, or the scalaron. This phenomenon can be understood in the language of the non-linear sigma model (NLSM), with the scalaron identified as the sigma-meson that linearizes the NLSM.

Videoconference
BSM Forum
Zoom Meeting ID
65562333965
Host
Elena Gianolio
Alternative hosts
Matthew Philip Mccullough, Daniele Teresi, Joachim Kopp, Benoit Loyer, Nicholas Llewellyn Rodd
Passcode
01055539