Conformal Killing cosmology -- Geometry, dark sector, growth of structures, and big rip

TL;DR

This paper introduces Sinyukov-like tensors in conformal Killing gravity, explores their role in cosmology, tests their implications with observational data, and analyzes the evolution of structures, revealing a potential future big rip singularity.

Contribution

It proposes Sinyukov-like tensors as a new dark sector component in conformal Killing gravity and tests their cosmological implications against observational data.

Findings

Dark and Lambda terms sum close to Lambda-CDM values.

No significant deviation from Lambda-CDM in structure growth.

Future big rip singularity is predicted for positive Omega values.

Abstract

We introduce Sinyukov-like tensors, a special kind of conformal Killing tensors. In Robertson-Walker space-times they have the perfect-fluid form and only depend on two constants and the scale factor. They are the candidate for the dark term of the newly proposed Conformal Killing Gravity, by Harada. In addition to ordinary matter, the Friedmann equations contain a dark term and a Lambda term that parametrize the Sinyukov-like tensor. The expression of H(z) is tested on cosmological data based on cosmic chronometers CC or including baryon acoustic oscillations BAO. There is a large incertitude in Omega_Lambda and Omega_dark that may become negative, but their sum is close to Omega_Lambda of Lambda-CDM. In any case, there is a future singularity, that is a big rip for all Omegas positive. We solve the equation for the evolution, in linear approximation, of the density contrast in matter-dominated universe. The dark sector and the Lambda term give no significative deviation from Lambda-CDM and GR results.