Eur. Phys. J. C (2014) 74: 3127
https://doi.org/10.1140/epjc/s10052-014-3127-5

Regular Article - Theoretical Physics

Growth rate in the dynamical dark energy models

¹ Astro Space Center of P.N. Lebedev Physical Institute, Russia, 84/32 Profsoyuznaya str., Moscow, 117997, Russia
² Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS, 66506, USA
³ McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA, 15213, USA
⁴ Department of Physics, Laurentian University, Ramsey Lake Road, Sudbury, ON, P3E 2C, Canada
⁵ Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., Tbilisi, 0194, Georgia

^* e-mail: olga.avsajanishvili@iliauni.edu.ge

Received: 28 August 2014
Accepted: 9 October 2014
Published online: 5 November 2014

Abstract

Dark energy models with a slowly rolling cosmological scalar field provide a popular alternative to the standard, time-independent cosmological constant model. We study the 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 that describes the steepness of the scalar field potential.