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.

Gleyzes, J., Langlois, D., Mancarella, M., Vernizzi, F. (2015). Effective theory of interacting dark energy. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2015(8) [10.1088/1475-7516/2015/08/054].

Effective theory of interacting dark energy

Mancarella M.;
2015

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.
Articolo in rivista - Articolo scientifico
dark energy theory; modified gravity;
English
2015
2015
8
054
none
Gleyzes, J., Langlois, D., Mancarella, M., Vernizzi, F. (2015). Effective theory of interacting dark energy. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2015(8) [10.1088/1475-7516/2015/08/054].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/400830
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