Work

Equation of state for dark energy in f ( T ) gravity

Year: 2011

Type: article

Abstract: We study the cosmological evolutions of the equation of state for dark energy w DE in the exponential and logarithmic as well as their combination f ( T ) theories. We show that the crossing of the phantom divide line of w DE = −1 can be realized in the combined f ( T ) theory even though it cannot be in the exponential or logarithmic f ( T ) theory. In particular, the crossing is from w DE > −1 to w DE < −1, in the opposite manner from f ( R ) gravity models. We also demonstrate that this feature is favored by the recent observational data.

Source: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2011/01/021

Authors: Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee, Ling-Wei Luo

Institutions: National Tsing Hua University, Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Council, National Tsing Hua University

Award: G7604507047