Dynamical dark energy in the no-scale Brans-Dicke gravity
Abstract
We add a new scalar field in the no-scale Brans-Dicke gravity and require it to have a global O(2) symmetry with the original scalar field in the Brans-Dicke gravity. This gives us a new massless scalar field in the Einstein frame due to the SO(2) symmetry. We then explicitly break the O(2) symmetry to a symmetry, and this scalar field gains a periodic potential. This scalar field can serve as the quintessence field to explain dark energy. If we further add the term and the non-minimal coupling to the Higgs field, we can realize inflation and reheating, and this leads to a super-Planckian decay constant of the quintessence potential. The super-Planckian decay constant is consistent with the newly released observational data according to a recent analysis.
Cite
@article{arxiv.2506.01543,
title = {Dynamical dark energy in the no-scale Brans-Dicke gravity},
author = {Muzi Hong and Kyohei Mukaida and Tsutomu T. Yanagida},
journal= {arXiv preprint arXiv:2506.01543},
year = {2025}
}