A quintessence dynamical dark energy model from ratio gravity

TL;DR

This paper introduces a dynamical dark energy model derived from ratio gravity, where the quintessence field evolves over time, matching local H_0 measurements and differing from standard models.

Contribution

It develops a novel quintessence dark energy model based on ratio gravity, linking geometric deformation to cosmic acceleration.

Findings

The model's solutions show the quintessence field oscillates over cosmic time.

Parameter constraints align local H_0 measurements with Planck CMB data.

The model predicts different dark energy behavior in early and late universe.

Abstract

Based on the work of ratio gravity developed in 2018, which postulates the deformation of the cross ratio to associate with the physical model of gravity, we develop a mechanism to generate dynamical dark energy - a quintessence field coupled with gravity. Such model causes the dark energy behaving differently in early and late time universe. In the radiation-dominated-era and matter-dominated-era, the related analytical solutions of the quintessence field have an interesting property - starting as a constant field, then oscillating as the universe expands. By Markov Chain Monte Carlo search of the parameter space with the local measurement (Type Ia supernovae) in the Bayesian framework, the probed range of {H_0} (within 1{\sigma}) overlaps the {H_0} value inferred from Planck CMB dataset by {\Lambda}CDM model.