Work

Palatini approach and large-scale magnetogenesis

Year: 2021

Type: article

Abstract: Large-scale magnetogenesis is analyzed within the Palatini approach when the gravitational action is supplemented by a contribution that is nonlinear in the Einstein-Hilbert term. While the addition of the nonlinear terms does not affect the scalar modes of the geometry during the inflationary phase, the tensor-to-scalar ratio is nonetheless suppressed. In this context it is plausible to have a stiff phase following the standard inflationary stage provided the potential has a quintessential form. The large-scale magnetic fields can even be a fraction of the nG over typical length scales of the order of the Mpc prior to the gravitational collapse of the protogalaxy.

Source: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2021/11/058

Author: Massimo Giovannini

Institutions: Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca, European Organization for Nuclear Research

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: $2,820

Funder: CERN