Cosmic acceleration from second order gauge gravity

TL;DR

This paper proposes a second order gauge gravity model that modifies long-range gravitational interactions, leading to a cosmological scenario with recent accelerated expansion, consistent with observational data and comparable universe age estimates.

Contribution

It introduces a novel second order gauge gravity framework that explains cosmic acceleration without dark energy, aligning with observational constraints.

Findings

The model predicts a transition to acceleration at about 9.3 Gyr ago.

Estimated universe age matches standard cosmological predictions.

The theory provides a viable alternative to dark energy models.

Abstract

We construct a phenomenological theory of gravitation based on a second order gauge formulation for the Lorentz group. The model presents a long-range modification for the gravitational field leading to a cosmological model provided with an accelerated expansion at recent times. We estimate the model parameters using observational data and verify that our estimative for the age of the Universe is of the same magnitude than the one predicted by the standard model. The transition from the decelerated expansion regime to the accelerated one occurs recently (at $\sim9.3\;Gyr$).