Unified dynamical system formulations for $f(R,\varphi ,X)$ gravity with applications to nonminimal derivative coupling and $R^2$-Higgs inflation

Abstract

Two different dynamical system formulations are presented that can be implemented to analyze a rather large class of modified gravity theories within the generic $f(R,\varphi ,X)$ family. As illustrative examples, the first and the second formulation is applied to study the phase space of a toy model of the Non-Minimal Derivative Coupling (NMDC) without a potential, and the mixed $R^2$-Higgs inflation model, respectively. The first dynamical system formulation applied to the toy NMDC model, although able to identify several invariant submanifolds, fails to fully investigate the fixed point structure, as all the fixed points turn out to be non-hyperbolic. We, however, discover an interesting feature that the qualitative dynamics are independent of the coupling strength between the Ricci scalar and the scalar field derivative for the particular toy model under consideration. The second dynamical system formulation applied to the mixed $R^2$-Higgs inflation model performs much better, being able to correctly reduce to the individual phase spaces of the $R^2$ and Higgs inflation separately in special cases, as well as correctly delivering the expected invariant submanifolds and fixed points. For the mixed $R^2$-Higgs case, illustrative phase portraits are provided for a somewhat better visual understanding of the dynamics.

19 pages, 2 figures, 2 tables. CQG accepted version. Figures and text modified

References in corpus (11)

• Conditions for the cosmological viability of f(R) dark energy models
• On the evolution of universes in quadratic theories of gravity
• Some remarks on the dynamical systems approach to fourth order gravity
• Cosmic infinity: A dynamical system approach
• $f(\mathcal{R},\phi ,\chi )$ Cosmology with Noether Symmetry
• Dynamical equivalence of $f(R)$ gravity in Jordan and Einstein frames
• A note on the dynamical system formulations in $f(R)$ gravity
• Testing scale-invariant inflation against cosmological data
• Unification of cosmological scalar fields
• A comprehensive analysis of the compact phase space for Hu-Sawicki $f(R)$ dark energy models including spatial curvature
• Classical and quantum trace-free Einstein cosmology