Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-04
Phys.Rev.D75:044014,2007
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1103/PhysRevD.75.044014
A self consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relations. In this paper we study the evolution of a homogeneous and isotropic universe in the presence of such a vector field with a minimum lying along the time-like direction. A plethora of different regimes is identified, such as accelerated expansion, loitering, collapse and tracking.
Ferreira Pedro G.
Gripaios Ben M.
Saffari Reza
Zlosnik Thomas G.
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