Self-tuning kinetic gravity braiding: Cosmological dynamics, shift symmetry, and the tadpole

Abstract

We study the self-tuning subclass of kinetic gravity braiding and obtain robust predictions on self-tuning and dynamics in the tadpole-free shift symmetric sector of the theory. In particular, we show inevitability of cosmic acceleration, prove the dynamical stability of this late-time asymptotic state, and derive ghost and gradient stability constraints on the self-tuning vacuum. We discuss the results concretely in the context of generalized cubic covariant Galileon theory and an exponential kinetic gravity braiding.

arXiv comment32 pages, 11 figures, version accepted in JCAP

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• Tadpole Cosmology: Self Tuning Without Degeneracy
• The nonlinear anisotropic model of the Universe with the linear potential
• Tadpole Cosmology: Milne Solution as a Cosmological Constant Hideout