GIALAMAS, Ioannis D., Alexandros KARAM, Thomas PAPPAS and Eemeli TOMBERG. Implications of Palatini gravity for inflation and beyond. INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS. 2023, vol. 20, No 13, p. "2330007-1"-"2330007-47", 47 pp. ISSN 0219-8878. Available from: https://dx.doi.org/10.1142/S0219887823300076.
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Basic information
Original name Implications of Palatini gravity for inflation and beyond
Authors GIALAMAS, Ioannis D., Alexandros KARAM, Thomas PAPPAS (300 Greece, belonging to the institution) and Eemeli TOMBERG.
Edition INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS, 2023, 0219-8878.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher Singapore
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/23:A0000294
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1142/S0219887823300076
UT WoS 001036959400003
Keywords in English Cosmic inflation;Palatini gravity;review
Tags RIV24, UF
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 13/2/2024 14:59.
Abstract
In this paper, we present an introduction to cosmic inflation in the framework of Palatini gravity, which provides an intriguing alternative to the conventional metric formulation of gravity. In the latter, only the metric specifies the spacetime geometry, whereas in the former, the metric and the spacetime connection are independent variables-an option that can result in a gravity theory distinct from the metric one. In scenarios where the field(s) responsible for cosmic inflation are non-minimally coupled to gravity or the gravitational sector is extended, assumptions about the underlying gravitational degrees of freedom can have substantial implications for the observational effects of inflation. We examine this explicitly by discussing various compelling scenarios, such as Higgs inflation with a non-minimal coupling to gravity, Higgs inflation with a non-minimal derivative coupling, R-2 inflation, and beyond. We also comment on reheating in these models. Finally, as an application of the general results of Palatini R-2 inflation, we review a model of successful quintessential inflation, where a single scalar field acts initially as the inflaton and then becomes dynamical dark energy, in agreement will all experimental constraints.
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