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arXiv · 2308.06406

Observational Constraints on Early Coupled Quintessence

Lisa W. K. Goh·Joan Bachs-Esteban·Adrià Gómez-Valent·Valeria Pettorino·Javier Rubio
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Abstract

We investigate an Early Coupled Quintessence model where a light scalar mediates a fifth force stronger than gravity among dark matter particles and leads to the growth of perturbations prior to matter-radiation equality. Using cosmological data from the $\textit{Planck}$ Cosmic Microwave Background power spectra, the Pantheon+ Type 1a Supernovae, Baryon Acoustic Oscillations, and Big Bang Nucleosynthesis, we constrain the coupling strength $\beta$ and the redshift $z_{\rm OFF}$ at which the interaction becomes effectively inactive, finding a firm degeneracy between these two parameters which holds true regardless of when the scaling regime begins.

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Lisa W. K. Goh, Joan Bachs-Esteban, Adrià Gómez-Valent, Valeria Pettorino, Javier Rubio. 2023-08-11. Observational Constraints on Early Coupled Quintessence. https://doi.org/10.1103/physrevd.109.023530

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