title: Growth rate in the dynamical dark energy models.
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 [Formula: see text] that describes the steepness of the scalar field potential.
authors.affiliation: Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., Tbilisi, 0194 Georgia.
authors.forename: Olga
authors.initials: O
authors.lastname: Avsajanishvili
authors.affiliation: Astro Space Center of P.N. Lebedev Physical Institute, Russia, 84/32 Profsoyuznaya str., Moscow, 117997 Russia.
authors.forename: Natalia A
authors.initials: NA
authors.lastname: Arkhipova
authors.affiliation: Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506 USA ; Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., Tbilisi, 0194 Georgia.
authors.forename: Lado
authors.initials: L
authors.lastname: Samushia
authors.affiliation: McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213 USA ; Department of Physics, Laurentian University, Ramsey Lake Road, Sudbury, ON P3E 2C Canada ; Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., Tbilisi, 0194 Georgia.
authors.forename: Tina
authors.initials: T
authors.lastname: Kahniashvili