Interacting quintessence from a variational approach Part II: derivative couplings

Abstract

We consider an original variational approach for building new models of quintessence interacting with dark or baryonic matter. The coupling is introduced at the Lagrangian level using a variational formulation for relativistic fluids, where the interacting term generally depends on both the dynamical degrees of freedom of the theory and their spacetime derivatives. After deriving the field equations from the action, we consider applications in the context of cosmology. Two simple models are studied using dynamical system techniques showing the interesting phenomenology arising in this framework. We find that these models contain dark energy dominated late time attractors with early time matter dominated epochs and also obtain a possible dynamical crossing of the phantom barrier. The formulation and results presented here complete and expand the analysis exposed in the first part of this work, where only algebraic couplings, without spacetime derivatives, were considered.

18 pages, 6 figures, Part II of arXiv:1501.06540; updated and slightly extended, matches published version

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Cited by in corpus (11)

• Interacting quintessence from a variational approach Part I: algebraic couplings
• Cosmological direct detection of dark energy: non-linear structure formation signatures of dark energy scattering with visible matter
• Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
• Scalar-Fluid interacting dark energy: cosmological dynamics beyond the exponential potential
• Velocity-dependent interacting dark energy and dark matter with a Lagrangian description of perfect fluids
• Extended Phase Space Analysis of Interacting Dark Energy Models in Loop Quantum Cosmology
• Kinetically coupled dark energy
• Lagrangian description of cosmic fluids: mapping dark energy into unified dark energy
• On-shell Lagrangian of an ideal gas
• Dissecting kinetically coupled quintessence: phenomenology and observational tests
• Coupled dark energy model inspired from general conformal transformation