J 2020

Palatini-Higgs inflation with nonminimal derivative coupling

GIALAMAS, Ioannis D., Alexandros KARAM, Angelos LYKKAS and Thomas PAPPAS

Basic 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

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.