Effective Theory of Interacting Dark Energy

Jérôme Gleyzes (1, 2) , David Langlois (3) , Michele Mancarella (2, 1) , Filippo Vernizzi (2)

1 UP11 - Université Paris-Sud - Paris 11
2 IPHT - Institut de Physique Théorique - UMR CNRS 3681
3 APC-Gravitation - APC - Gravitation

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.

Domains: General Relativity and Quantum Cosmology [gr-qc]

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⟩