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arXiv · 2107.01423

Vainshtein Mechanism in Generalised Massive Gravity

A. Emir Gumrukcuoglu·Rampei Kimura·Michael Kenna-Allison·Kazuya Koyama
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Abstract

We present a non-linear analysis of perturbations around cosmological solutions in Generalised Massive gravity. This Lorentz invariant theory is an extension of de Rham, Gabadadze, Tolley massive gravity that propagates $5$ degrees of freedom while allowing stable open FLRW cosmologies. For a minimal model that supports a self-accelerating background, we study the dynamics of non-linear perturbations. We find that the equation for the scalar graviton is distinct from the analogues in Horndeski and DHOST theories. We numerically solve the equation to find a new type of nonlinear solution for the scalar mode, and confirm the presence of a Vainshtein screening mechanism. We show that the PPN parameter approaches its GR value at solar system scales and satisfies the current bounds.

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A. Emir Gumrukcuoglu, Rampei Kimura, Michael Kenna-Allison, Kazuya Koyama. 2021-07-03. Vainshtein Mechanism in Generalised Massive Gravity. https://doi.org/10.1088/1475-7516%2F2021%2F09%2F023

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