Teleparallel Dark Energy with Purely Non-minimal Coupling to Gravity

Дата и время публикации : 2012-04-18T11:19:48Z

Авторы публикации и институты :
Je-An Gu
Chung-Chi Lee
Chao-Qiang Geng

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 12 pages, 3 figures, Title changed, Revised Version Accepted for publication in Phys. Lett. B
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, gr-qc

Краткий обзор статьи: We propose the simplest model of teleparallel dark energy with purely a non-minimal coupling to gravity but no self-potential, a single model possessing various interesting features: simplicity, self-potential-free, the guaranteed late-time cosmic acceleration driven by the non-minimal coupling to gravity, tracker behavior of the dark energy equation of state at earlier times, a crossing of the phantom divide at a late time, and the existence of a finite-time future singularity. We find the analytic solutions of the dark-energy scalar field respectively in the radiation, matter, and dark energy dominated eras, thereby revealing the above features. We further illustrate possible cosmic evolution patterns and present the observational constraint of this model obtained by numerical analysis and data fitting.

Category: Physics