Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/12/021
Keywords
modified gravity; gravity
Funding
- Fundacao para a Ciencia e Tecnologia through an Investigador FCT Research contract - FCT/MCTES (Portugal) [IF/00859/2012]
- CAPES
- FAPEMIG
- European Social Fund (ESF)
- Greek State
- Operational Program Education and Lifelong Learning (Actions Beneficiary: General Secretariat for Research and Technology)
- [CERN/FP/123618/2011]
- [EXPL/FIS-AST/1608/2013]
- Fundação para a Ciência e a Tecnologia [EXPL/FIS-AST/1608/2013] Funding Source: FCT
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We present an extension of f (T) gravity, allowing for a general coupling of the torsion scalar T with the trace of the matter energy-momentum tensor T. The resulting f (T, T) theory is a new modified gravity, since it is different from all the existing torsion or curvature based constructions. Applied to a cosmological framework, it leads to interesting phenomenology. In particular, one can obtain a unified description of the initial inflationary phase, the subsequent non-accelerating, matter-dominated expansion, and then the transition to a late-time accelerating phase. Additionally, the effective dark energy sector can be quintessence or phantom-like, or exhibit the phantom-divide crossing during the evolution. Moreover, in the far future the universe results either to a de Sitter exponential expansion, or to eternal power-law accelerated expansions. Finally, a detailed study of the scalar perturbations at the linear level reveals that f (T, T) cosmology can be free of ghosts and instabilities for a wide class of ansatzes and model parameters.
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