Propagation of tensor perturbation in Horndeski-like gravity

Fabiano F. Santos; Jackson Levi Said

Propagation of tensor perturbation in Horndeski-like gravity

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arxiv 2401.03558 v3 pith:OX5CCT36 submitted 2024-01-07 gr-qc hep-th

Fabiano F. Santos , Jackson Levi Said This is my paper · ORCID

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Scalar-tensor theories have shown promise in many sectors of cosmology. However, recent constraints from the speed of gravitational waves have put severe limits on the breadth of models such classes of theories can realize. In this work, we explore the possibility of a Horndeski Lagrangian that is equipped with two dilaton fields. The evolution of a two-dilation coupled cosmology is not well-known in the literature. We explore the tensor perturbations in order to assess the behavior of the model again the speed of gravitational wave constraint. Our main result is that this model exhibits of a class of cosmological theories that is consistent with this observational constraint.

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Cosmological scalar perturbations in Horndeski-like gravity
gr-qc 2025-01 conditional novelty 4.0 of 10

For a Horndeski-like scalar-tensor model with a chosen background solution, scalar stability and entropy-production bounds restrict the coupling gamma to be non-positive and constrain gamma*Lambda relative to alpha.

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