Effective theory of interacting dark energy

Journal Article · Sat Aug 01 00:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/08/054· OSTI ID:22525499

Gleyzes, Jérôme; Mancarella, Michele; Vernizzi, Filippo ^[1]; Langlois, David ^[2]

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1. CEA, IPhT, 91191 Gif-sur-Yvette cédex (France)
2. APC, (CNRS-Université Paris 7), 10 rue Alice Domon et Léonie Duquet, 75205 Paris (France)

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.

• OSTI ID: 22525499
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COUPLING
DISTURBANCES
EQUATIONS OF MOTION
FLUIDS
GRAVITATION
INSTABILITY
NONLUMINOUS MATTER
RELATIVISTIC RANGE