Implications of Palatini gravity for inflation and beyond

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F23%3AA0000294" target="_blank" >RIV/47813059:19630/23:A0000294 - isvavai.cz</a>

Result on the web

<a href="https://www.worldscientific.com/doi/10.1142/S0219887823300076" target="_blank" >https://www.worldscientific.com/doi/10.1142/S0219887823300076</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1142/S0219887823300076" target="_blank" >10.1142/S0219887823300076</a>

Result language

angličtina

Original language name

Implications of Palatini gravity for inflation and beyond

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS

ISSN

0219-8878

e-ISSN

—

Volume of the periodical

20

Issue of the periodical within the volume

13

Country of publishing house

SG - SINGAPORE

Number of pages

47

Pages from-to

„2330007-1“-„2330007-47“

UT code for WoS article

001036959400003

EID of the result in the Scopus database

2-s2.0-85175866632