Journal
PHYSICAL REVIEW D
Volume 91, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.083537
Keywords
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Funding
- STFC Grant [ST/L0003934/1, ST/H002774/1]
- Royal Society
- European Research Council
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC [617656]
- Science and Technology Facilities Council [ST/L000393/1, ST/H002774/1, ST/K00090X/1] Funding Source: researchfish
- STFC [ST/K00090X/1, ST/L000393/1, ST/H002774/1] Funding Source: UKRI
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We 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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