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arXiv · 2605.07344

DESI and Dynamical Dark Energy from Extended Pre-geometric Gravity

Andrea Addazi·Yermek Aldabergenov·Daulet Berkimbayev·Yifu Cai·Salvatore Capozziello·Giuseppe Meluccio
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Abstract

We consider the simplest quadratic extension of MacDowell-Mansouri pre-geometric gravity preserving the topological pre-volume form symmetry. After symmetry breaking, it becomes $(\mathrm{Lovelock})^2$ gravity, dual to a Galileon-like Horndeski scalar-tensor theory. The gravitational Higgs mechanism forces the Gauss-Bonnet coupling to be inversely proportional to the bare cosmological constant. The quadratic correction renders the gravitational $\theta$-angle dynamical in the form of a gravi-axion, whose effective mass sets the dark energy scale, thus naturally realizing a dynamical dark energy. The model fits DESI's BAO+FS data exceptionally well ($\chi^2_{\rm red} = 1.394$), deviating from $\Lambda\mathrm{CDM}$ by only a few percent in the gravitational slip parameter $\gamma(z)$ with stable tensor perturbations. This analysis establishes a concrete, testable bridge between pre-geometric gravity and cosmic acceleration.

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Andrea Addazi, Yermek Aldabergenov, Daulet Berkimbayev, Yifu Cai, Salvatore Capozziello, Giuseppe Meluccio. 2026-05-08. DESI and Dynamical Dark Energy from Extended Pre-geometric Gravity. https://arxiv.org/abs/2605.07344

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