Palatini approach and large-scale magnetogenesis

Author:

Giovannini Massimo

Abstract

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.

Publisher

IOP Publishing

Subject

Astronomy and Astrophysics

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Implications of Palatini gravity for inflation and beyond;International Journal of Geometric Methods in Modern Physics;2023-07-25

2. Effective field theory of magnetogenesis identify necessary and sufficient conditions;Journal of Cosmology and Astroparticle Physics;2023-01-01

3. Issues in Palatini R2 inflation: Bounds on the reheating temperature;Physical Review D;2022-12-30

4. Hypermagnetogenesis from axion inflation: Model-independent estimates;Physical Review D;2022-02-22

5. Primordial helical magnetic fields from inflation?;Physical Review D;2022-01-26

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