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Cosmological dynamics of Scalar--Tensor Gravity

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arxiv gr-qc/0701009 v3 pith:J7WW6RU5 submitted 2006-12-31 gr-qc

Cosmological dynamics of Scalar--Tensor Gravity

S Carloni , J A Leach , S Capozziello , P K S Dunsby This is my paper
classification gr-qc
keywords towardsevolvinggravityphasespotentialscalar--tensoracceleratedaction
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We study the phase--space of FLRW models derived from Scalar--Tensor Gravity where the non--minimal coupling is $F(\phi)=\xi\phi^2$ and the effective potential is $V(\phi)=\lambda \phi^n$. Our analysis allows to unfold many feature of the cosmology of this class of theories. For example, the evolution mechanism towards states indistinguishable from GR is recovered and proved to depend critically on the form of the potential $V(\phi)$. Also, transient almost--Friedmann phases evolving towards accelerated expansion and unstable inflationary phases evolving towards stable ones are found. Some of our results are shown to hold also for the String-Dilaton action.

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Cited by 3 Pith papers

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  2. On phase-space singular surfaces in $f(R)$ gravity

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    Hamiltonian analysis reveals degenerate constraints on singular surfaces in f(R) gravity, leading to empty spectra on certain backgrounds and regularity conditions for dynamical crossings in Starobinsky model.

  3. Modified Gravity and Cosmology

    astro-ph.CO 2011-06 unverdicted novelty 2.0

    A comprehensive review of modified gravity theories and their cosmological consequences, including a parameterized post-Friedmannian formalism for constraining deviations from General Relativity.