Implications of Palatini gravity for inflation and beyond

@article{76405,
   author = {Gialamas, Ioannis D. and Karam, Alexandros and Pappas, Thomas and Tomberg, Eemeli},
   article_number = {13},
   doi = {http://dx.doi.org/10.1142/S0219887823300076},
   keywords = {Cosmic inflation;Palatini gravity;review},
   language = {eng},
   issn = {0219-8878},
   journal = {INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS},
   title = {Implications of Palatini gravity for inflation and beyond},
   url = {https://www.worldscientific.com/doi/10.1142/S0219887823300076},
   volume = {20},
   year = {2023}
}

TY  - JOUR
ID  - 76405
AU  - Gialamas, Ioannis D. - Karam, Alexandros - Pappas, Thomas - Tomberg, Eemeli
PY  - 2023
TI  - Implications of Palatini gravity for inflation and beyond
JF  - INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
VL  - 20
IS  - 13
SP  - "2330007-1"-"2330007-47"
EP  - "2330007-1"-"2330007-47"
SN  - 02198878
KW  - Cosmic inflation;Palatini gravity;review
UR  - https://www.worldscientific.com/doi/10.1142/S0219887823300076
N2  - 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.
ER  - 

GIALAMAS, Ioannis D., Alexandros KARAM, Thomas PAPPAS a Eemeli TOMBERG. Implications of Palatini gravity for inflation and beyond. \textit{INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS}. 2023, roč.~20, č.~13, s.~''2330007-1''-''2330007-47'', 47 s. ISSN~0219-8878. Dostupné z: https://dx.doi.org/10.1142/S0219887823300076.