Rescuing quartic and natural inflation in the Palatini formalism

Antoniadis, Ignatios; Karam, A.; Lykkas, A.; Pappas, T.; Tamvakis, K. (2019). Rescuing quartic and natural inflation in the Palatini formalism. Journal of cosmology and astroparticle physics, 2019(03), 005-005. Institute of Physics Publishing IOP 10.1088/1475-7516/2019/03/005

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When considered in the Palatini formalism, the Starobinsky model does not provide us with a mechanism for inflation due to the absence of a propagating scalar degree of freedom. By (non)-minimally coupling scalar fields to the Starobinsky model in the Palatini formalism we can in principle describe the inflationary epoch. In this article, we focus on the minimally coupled quartic and natural inflation models. Both theories are excluded in their simplest realization since they predict values for the inflationary observables that are outside the limits set by the Planck data. However, with the addition of the R2 term and the use of the Palatini formalism, we show that these models can be rendered viable.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Antoniadis, Ignatios

Subjects:

500 Science > 530 Physics

ISSN:

1475-7516

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

02 Jul 2019 09:26

Last Modified:

03 Nov 2019 04:54

Publisher DOI:

10.1088/1475-7516/2019/03/005

ArXiv ID:

1812.00847

BORIS DOI:

10.7892/boris.130669

URI:

https://boris.unibe.ch/id/eprint/130669

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