Work

Cosmological collider non-Gaussianity from multiple scalars and R2 gravity

Year: 2024

Type: article

Abstract: A bstract Cosmological collider signals of primordial non-Gaussianity arise at tree level when an extra scalar has Hubble mass during inflation. We critically review the formalism finding that a large class of inflationary theories, based on Planck-scale physics, predict a scalar bi-spectrum around the gravitational floor level. This mild signal arises for example in R 2 gravity, in the regime where its gravitational scalar has Hubble-scale mass. Signals much above the gravitational floor arise in theories where scalars undergo multiple turns during inflation, thanks to sub-Planckian physics.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep11(2024)009

Authors: Shuntaro Aoki, Anish Ghoshal, Alessandro Strumia

Institutions: Institute for Basic Science, University of Warsaw, University of Pisa

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

OpenAlex ID: W4404185920

FWCI: 2.098

Cites: 106

Cited by: 11

Related to: 10