Parametrized post-Friedmannian framework for interacting dark energy theoriesTools Skordis, C., Pourtsidou, A. and Copeland, Edmund J. (2015) Parametrized post-Friedmannian framework for interacting dark energy theories. Physical Review D, 91 (8). 083537-1-083537-11. ISSN 2470-0029 Full text not available from this repository.AbstractWe present the most general parametrization of models of dark energy in the form of a scalar field which is explicitly coupled to dark matter. We follow and extend the parametrized post-Friedmannian approach, previously applied to modified gravity theories, in order to include interacting dark energy. We demonstrate its use through a number of worked examples and show how the initially large parameter space of free functions can be significantly reduced and constrained to include only a few nonzero coefficients. This paves the way for a model-independent approach to classify and test interacting dark energy theories.
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