Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Parameterized Post-Friedmannian Framework for Interacting Dark
  Energy Theories   We present the most general parametrisation of models of dark energy in the
form of a scalar field which is explicitly coupled to dark matter. We follow
and extend the Parameterized 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 non-zero coefficients. This paves the way
for a model-independent approach to classify and test interacting dark energy
theories.

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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol