English

Healthy Horndeski cosmologies with torsion

General Relativity and Quantum Cosmology 2024-07-22 v2 High Energy Physics - Theory

Abstract

We show that the full Horndeski theory with both curvature and torsion can support nonsingular, stable and subluminal cosmological solutions at all times. Thus, with torsion, the usual No-Go theorem that holds in a curved spacetime is avoided. In particular, it is essential to include the nonminimal derivative couplings of the L5\mathcal{L}_{5} part of the Horndeski action (Gμνμνϕ,G^{\mu\nu}\,\nabla_\mu \nabla_\nu \phi, and (2ϕ)3(\nabla^2 \phi)^3). Without the latter a No-Go already impedes the eternal subluminality of nonsingular, stable cosmologies.

Keywords

Cite

@article{arxiv.2405.08673,
  title  = {Healthy Horndeski cosmologies with torsion},
  author = {S. Mironov and M. Valencia-Villegas},
  journal= {arXiv preprint arXiv:2405.08673},
  year   = {2024}
}

Comments

21 pages, 13 Figures. Version accepted for publication in JCAP. Results unchanged. Added references