Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-24
Phys.Rev.D79:044033,2009
Astronomy and Astrophysics
Astrophysics
Discussion extended, Accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.79.044033
Major observational efforts in the coming decade are designed to probe the equation of state of dark energy. Measuring a deviation of the equation-of-state parameter w from -1 would indicate a dark energy that cannot be represented solely by a cosmological constant. While it is commonly assumed that any implied modification to the LambdaCDM model amounts to the addition of new dynamical fields, we propose here a framework for investigating whether or not such new fields are required when cosmological observations are combined with a set of minimal assumptions about the nature of gravitational physics. In our approach, we treat the additional degrees of freedom as perturbatively constrained and calculate a number of observable quantities, such as the Hubble expansion rate and the cosmic acceleration, for a homogeneous Universe. We show that current observations place our Universe within the perturbative validity of our framework and allow for the presence of non-dynamical gravitational degrees of freedom at cosmological scales.
Cooney Alan
DeDeo Simon
Psaltis Dimitrios
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