Work

Geometric acceleration in f(Q, C) theories

Year: 2025

Type: article

Abstract: The f ( Q, C ) framework of gravity enables the depiction of an effective dark energy fluid that emerges from geometry itself, thus leading to modifications in the cosmological phenomenology of General Relativity. We pursue this approach to discover new and observationally supported (effective) evolving dark energy models. We propose a general f ( Q, C ) formulation that cannot be simply split into separate functions of Q and C , yet it still results in second-order field equations. By employing a particular type of connection, we derive guidelines for new cosmological models, including a variant of the DGP model that appears to be statistically favored over ΛCDM. Notably, we also demonstrate how to translate solutions within this f ( Q, C ) framework to f ( Q ) counterparts at the background level.

Source: Physics of the Dark Universe

DOI: 10.1016/j.dark.2025.102180

Authors: Mikel Artola, Ismael Ayuso, Ruth Lazkoz, Gonzalo Olmo, Vincenzo Salzano

Institutions: University of the Basque Country, Universidade Federal do Ceará, Instituto de Física Corpuscular, University of Szczecin

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,660