Gravitational corrections to electroweak vacuum decay: metric vs. Palatini

@article{76403,
   author = {Gialamas, Ioannis D and Karam, Alexandros and Pappas, Thomas},
   article_number = {May 2023},
   doi = {http://dx.doi.org/10.1016/j.physletb.2023.137885},
   keywords = {standard model;standard Einstein-Hilbert-Higgs action;stability of the electroweak vacuum;},
   language = {eng},
   issn = {0370-2693},
   journal = {Physics Letters B},
   title = {Gravitational corrections to electroweak vacuum decay: metric vs. Palatini},
   url = {https://www.sciencedirect.com/science/article/pii/S0370269323002198?via%3Dihub},
   volume = {840},
   year = {2023}
}

TY  - JOUR
ID  - 76403
AU  - Gialamas, Ioannis D - Karam, Alexandros - Pappas, Thomas
PY  - 2023
TI  - Gravitational corrections to electroweak vacuum decay: metric vs. Palatini
JF  - Physics Letters B
VL  - 840
IS  - May 2023
SP  - "137885-1"-"137885-6"
EP  - "137885-1"-"137885-6"
SN  - 03702693
KW  - standard model;standard Einstein-Hilbert-Higgs action;stability of the electroweak vacuum;
UR  - https://www.sciencedirect.com/science/article/pii/S0370269323002198?via%3Dihub
N2  - 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.
ER  - 

GIALAMAS, Ioannis D, Alexandros KARAM a Thomas PAPPAS. Gravitational corrections to electroweak vacuum decay: metric vs. Palatini. \textit{Physics Letters B}. 2023, roč.~840, May 2023, s.~''137885-1''-''137885-6'', 6 s. ISSN~0370-2693. Dostupné z: https://dx.doi.org/10.1016/j.physletb.2023.137885.