Growth rate in the dynamical dark energy models

Olga Avsajanishvili; Natalia A Arkhipova; Lado Samushia; Tina Kahniashvili

doi:10.1140/epjc/s10052-014-3127-5

Growth rate in the dynamical dark energy models

Eur Phys J C Part Fields. 2014;74(11):3127. doi: 10.1140/epjc/s10052-014-3127-5. Epub 2014 Nov 5.

Authors

Olga Avsajanishvili¹, Natalia A Arkhipova², Lado Samushia³, Tina Kahniashvili⁴

Affiliations

¹ Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., Tbilisi, 0194 Georgia.
² Astro Space Center of P.N. Lebedev Physical Institute, Russia, 84/32 Profsoyuznaya str., Moscow, 117997 Russia.
³ 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.
⁴ 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.

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.