2023
Implications of Palatini gravity for inflation and beyond
GIALAMAS, Ioannis D., Alexandros KARAM, Thomas PAPPAS a Eemeli TOMBERGZákladní údaje
Originální název
Implications of Palatini gravity for inflation and beyond
Autoři
GIALAMAS, Ioannis D., Alexandros KARAM, Thomas PAPPAS (300 Řecko, domácí) a Eemeli TOMBERG
Vydání
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS, 2023, 0219-8878
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10308 Astronomy
Stát vydavatele
Singapur
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Kód RIV
RIV/47813059:19630/23:A0000294
Organizační jednotka
Fyzikální ústav v Opavě
UT WoS
001036959400003
Klíčová slova anglicky
Cosmic inflation;Palatini gravity;review
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 13. 2. 2024 14:59, Mgr. Pavlína Jalůvková
Anotace
V originále
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.