GIALAMAS, Ioannis D, Alexandros KARAM and Thomas PAPPAS. Gravitational corrections to electroweak vacuum decay: metric vs. Palatini. Physics Letters B. 2023, vol. 840, May 2023, p. "137885-1"-"137885-6", 6 pp. ISSN 0370-2693. Available from: https://dx.doi.org/10.1016/j.physletb.2023.137885.
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Basic information
Original name Gravitational corrections to electroweak vacuum decay: metric vs. Palatini
Authors GIALAMAS, Ioannis D, Alexandros KARAM and Thomas PAPPAS (300 Greece, belonging to the institution).
Edition Physics Letters B, 2023, 0370-2693.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher Netherlands
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/23:A0000292
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1016/j.physletb.2023.137885
UT WoS 000982487300001
Keywords in English standard model;standard Einstein-Hilbert-Higgs action;stability of the electroweak vacuum;
Tags RIV24, UF
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 13/2/2024 14:51.
Abstract
We consider the standard Einstein-Hilbert-Higgs action where the Higgs field couples nonminimally with gravity via the term xi h2R, and investigate the stability of the electroweak vacuum in the presence of gravitational corrections in both the metric and Palatini formulations of gravity. In order to identify the differences between the two formalisms analytically, we follow a perturbative approach in which the gravitational corrections are taken into consideration via a leading order expansion in the gravitational coupling constant. Our analysis shows that in the Palatini formalism, the well-known effect of gravity suppressing the vacuum decay probability, becomes milder in comparison with the metric case for any value of the nonminimal coupling xi. Furthermore, we have found that in the Palatini formalism, the positivity of the gravitational corrections, which is a necessary requirement for the unitarity of the theory, entails the lower bound xi > -1/12.
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