Conformally Coupled Scalar- Field Dark Energy: Cosmological Dynamics with Early- and Late- Measurements
Year: 2026
Type: preprint
Abstract: In this work, the cosmology of the conformal interacting dark energy model is investigated by introducing a scalar field representing dark energy (DE) coupled to dark matter (DM) via a conformal transformation. This coupling yields a class of scalar+tensor theories; the interaction term ${Q}$, which indicates the flow of energy between the dark sectors, is proportional to the trace of the energy-momentum tensor of the DM fluid, $T^{\mathrm{DM}}_{μν}$, as ${Q}=\frac{C'(ϕ)}{2C(ϕ)}g^{μν}T^{\mathrm{DM}}_{μν}$, where $C(ϕ)$ is the conformal function of a scalar potential (coupling) field. We assume the power-law parametrization $C(ϕ)\propto (1+ϕ)^m$, with $m$ as the coupling parameter, and determine the direction and magnitude of energy flow between the DM and DE scalar-field components. We model DE in three scenarios: conformally interacting dark energy (CIDE) coupled to a scalar field, uncoupled scalar+field DE (UCSFDE), and standard $ Λ$CDM models. We confront these models with cosmological measurements to test the viability of CIDE and UCSFED against $Λ$CDM and constrain them using a combination of early and late time data, namely: Cosmic Microwave Background measurements from Planck 2018 Legacy (\texttt{CMB}); Baryon Acoustic Oscillation (BAO) data from the Dark Energy Survey (\texttt{ DESI DR2 DR2 BAO}); and Supernova Type Ia distance compilations (\texttt{PantheonPlus, PantheonPlus + SH0ES, Union3}, and \texttt{DES+Dovekie}). We perform parameter inference with Monte Carlo Markov Chain (\texttt{MCMC}) simulations using \texttt{COBAYA} and a modified \texttt{CLASS} ...
Source: arXiv (Cornell University)
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7212035915