Detailed Information on Publication Record
2020
Palatini-Higgs inflation with nonminimal derivative coupling
GIALAMAS, Ioannis D., Alexandros KARAM, Angelos LYKKAS and Thomas PAPPASBasic information
Original name
Palatini-Higgs inflation with nonminimal derivative coupling
Authors
GIALAMAS, Ioannis D., Alexandros KARAM, Angelos LYKKAS and Thomas PAPPAS (300 Greece, belonging to the institution)
Edition
Physical Review D, US - Spojené státy americké, 2020, 1550-7998
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/47813059:19630/20:A0000014
Organization unit
Institute of physics in Opava
UT WoS
000570028500002
Keywords in English
MODIFIED GRAVITY; COSMOLOGY; BOSON
Tags
Tags
International impact, Reviewed
Links
GA19-03950S, research and development project.
Změněno: 19/4/2021 13:19, Mgr. Pavlína Jalůvková
Abstract
V originále
The predictions of standard Higgs inflation in the framework of the metric formalism yield a tensor-to-scalar ratio r similar to 10(-3) which lies well within the expected accuracy of near-future experiments similar to 10(-4). When the Palatini formalism is employed, the predicted values of r get highly suppressed r similar to 10(-12) and consequently a possible nondetection of primordial tensor fluctuations will rule out only the metric variant of the model. On the other hand, the extremely small values predicted for r by the Palatini approach constitute contact with observations a hopeless task for the foreseeable future. In this work, we propose a way to remedy this issue by extending the action with the inclusion of a generalized nonminimal derivative coupling term between the inflaton and the Einstein tensor of the form m(-2)(phi)G(mu nu)del(mu) phi del(nu)phi. We find that with such a modification, the Palatini predictions can become comparable with the ones obtained in the metric formalism, thus providing ample room for the model to be in contact with observations in the near future.