Work

Generalised conditions for rapid-turn inflation

Year: 2024

Type: article

Abstract: Rapid-turn slow-roll inflationary trajectories have been shown to be an attractor in two-field models, provided the turn rate is near constant and larger than the slow-roll parameters. These trajectories can produce primordial spectra consistent with current observations on CMB scales. We present the generalized consistency condition for sustained rapid-turn inflationary trajectory with two fields, arbitrary field-space metric and potential valid for any value of the turn rate. This has to be supplemented by a second condition to ensure slow roll evolution. Both conditions together constitute a tool to identify inflationary trajectories with arbitrary values of the turning rate without having to solve the equations of motion. We present a Python package for the numerical identification of regions in field-space and parameter space that allow for rapid-turn trajectories.

Source: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2024/07/079

Authors: Raúl Wolters, Oksana Iarygina, Ana Achúcarro

Institutions: Leiden University, Utrecht University, Stockholm University, KTH Royal Institute of Technology, University of the Basque Country

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,135

Funders: European Commission, NordForsk, HORIZON EUROPE Marie Sklodowska-Curie Actions