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arXiv · 1511.09125

Cubic Derivative Interactions and Asymptotic Dynamics of the Galileon Vacuum

Roberto De Arcia·Tame Gonzalez·Genly León·Ulises Nucamendi·Israel Quiros
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Abstract

In this paper we apply the tools of the dynamical systems theory in order to uncover the whole asymptotic structure of the vacuum interactions of a galileon model with a cubic derivative interaction term. It is shown that, contrary to what occurs in the presence of background matter, the galileon interactions of vacuum appreciably modify the late-time cosmic dynamics. In particular, a local late-time attractor representing phantom behavior arises which is inevitably associated with a big rip singularity. It seems that the gravitational interactions of the background matter with the galileon screen the effects of the gravitational self-interactions of the galileon, thus erasing any potential modification of the late-time dynamics by the galileon vacuum processes. Unlike other galileon models inspired in the DGP scenario, self-accelerating solutions do not arise in this model.

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Roberto De Arcia, Tame Gonzalez, Genly León, Ulises Nucamendi, Israel Quiros. 2015-11-30. Cubic Derivative Interactions and Asymptotic Dynamics of the Galileon Vacuum. https://doi.org/10.1088/0264-9381%2F33%2F12%2F125036

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