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Journal Articles Journal of Cosmology and Astroparticle Physics Year : 2015

Effective Theory of Interacting Dark Energy

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Abstract

We present a unifying treatment of dark energy and modified gravity that allows distinct conformal-disformal couplings of matter species to the gravitational sector. In this very general approach, we derive the conditions to avoid ghost and gradient instabilities. We compute the equations of motion for background quantities and linear perturbations. We illustrate our formalism with two simple scenarios, where either cold dark matter or a relativistic fluid is nonminimally coupled. This extends previous studies of coupled dark energy to a much broader spectrum of gravitational theories.
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Dates and versions

cea-01458940 , version 1 (07-02-2017)

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Jérôme Gleyzes, David Langlois, Michele Mancarella, Filippo Vernizzi. Effective Theory of Interacting Dark Energy. Journal of Cosmology and Astroparticle Physics, 2015, 2015, pp.54 - 54. ⟨10.1088/1475-7516/2015/08/054⟩. ⟨cea-01458940⟩
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