Work

Novel phenomenological parametrization of dynamical dark energy via matter-gravity coupling

Year: 2026

Type: article

Abstract: We develop a new parametrization for generic departures from the $Λ$CDM model based on the Markov-Mukhanov action with non-minimal matter-gravity coupling. In this approach the cosmological constant $Λ$ and the gravitational coupling $G$ become dynamical with their values determined by the explicit form of the matter-gravity coupling. We use the framework to build a simple phenomenological model where dynamical dark energy is naturally obtained as a consequence of the departure of the theory from classical General Relativity at low densities. We show how the model's free parameters can be constrained from observational data and interpret the tentative observations of `phantom crossing' by the DESI collaboration in view of the proposed formalism.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/4xfd-8fkw

Authors: Hrishikesh Chakrabarty, Daniele Malafarina

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Strong, Nazarbayev University

Award: G3329231660

OpenAlex ID: W7214037167

FWCI:

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