Dynamical systems approach and generic properties of $f(T)$ cosmology

Abstract

We present a systematic analysis of the dynamics of flat Friedmann-Lemaître-Robertson-Walker cosmological models with radiation and dust matter in generalized teleparallel $f(T)$ gravity. We show that the cosmological dynamics of this model is fully described by a function $W(H)$ of the Hubble parameter, which is constructed from the function $f(T)$. After reducing the phase space to two dimensions we derive the conditions on $W(H)$ for the occurrence of de Sitter fixed points, accelerated expansion, crossing the phantom divide, and finite time singularities. Depending on the model parameters it is possible to have a bounce (from contraction to expansion) or a turnaround (from expansion to contraction), but cyclic or oscillating scenarios are prohibited. As an illustration of the formalism we consider power law $f(T)=T+\alpha (-T{)}^n$ models, and show that these allow only one period of acceleration and no phantom divide crossing.

45 pages, 3 figures; journal version

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• Matter Bounce Scenario in Extended Symmetric Teleparallel Gravity
• Einstein's cluster mimicking compact star in the teleparallel equivalent of general relativity
• Attractor behaviour of $f(T)$ modified gravity and the cosmic acceleration
• Dynamical systems analysis of $f(Q)$ gravity
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• Big Bang Nucleosynthesis constraints on $f(T,T_G)$ gravity
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• Non-minimally coupled teleparallel scalar field reconstruction of matter bounce scenario
• Evolution of Generalized Brans-Dicke parameter within a Superbounce scenario
• From inflation to dark energy in scalar-tensor cosmology
• Qualitative behaviour of higher-curvature gravity with boundary terms i.e the f(Q) gravity models by dynamical system analysis
• A Unified Dynamical Systems Framework for Cosmology in $f(Q)$ Gravity: Generic Features Beyond the Coincident Gauge