Growth Rate in the Dynamical Dark Energy Models

TL;DR

This paper investigates how dynamical dark energy models with scalar fields influence cosmic expansion and structure growth, using recent observational data to constrain model parameters.

Contribution

It introduces constraints on the steepness parameter of scalar field dark energy models using combined growth and expansion data.

Findings

Constraints on the potential steepness parameter α.

Compatibility of the model with recent growth rate measurements.

Implications for scalar field dark energy viability.

Abstract

Dark Energy models with slowly-rolling cosmological scalar field provide a popular alternative to the standard, time-independent cosmological constant model. We study simultaneous evolution of background expansion and growth in the scalar field model with the Ratra-Peebles self-interaction potential. We use recent measurements of the linear growth rate and the baryon acoustic oscillation peak positions to constrain the model parameter $\alpha$ that describes the steepness of the scalar field potential.