GIALAMAS, Ioannis D., Alexandros KARAM, Angelos LYKKAS and Thomas PAPPAS. Palatini-Higgs inflation with nonminimal derivative coupling. Physical Review D. US - Spojené státy americké, 2020, vol. 102, No 6, p. "063522-1"-"063522-14", 14 pp. ISSN 1550-7998. Available from: https://dx.doi.org/10.1103/PhysRevD.102.063522.
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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
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/20:A0000014
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1103/PhysRevD.102.063522
UT WoS 000570028500002
Keywords in English MODIFIED GRAVITY; COSMOLOGY; BOSON
Tags FÚ, FÚ2020, GA19-03950S, RIV21
Tags International impact, Reviewed
Links GA19-03950S, research and development project.
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 19/4/2021 13:19.
Abstract
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.
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