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arXiv · 1902.01251

Cosmological Shapes of Higher-Spin Gravity

D. Anninos·V. De Luca·G. Franciolini·A. Kehagias·A. Riotto
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Abstract

We explore non-Gaussian features of a massless spin-two field in the Vasiliev theory of higher-spin gravity. The theory contains an infinite tower of interacting gauge fields with increasing spin, and admits four-dimensional asymptotically de Sitter configurations. Using a recent proposal for calculating late-time quantum correlations in Vasiliev theory, we provide an exact formula for the tensor non-Gaussianities of the massless spin-two graviton field. By general symmetry considerations, we relate our result to that produced by a tree-level calculation in a gravitational theory containing an Einstein term and a term cubic in the Weyl tensor. The relative coefficient between the two terms is calculated explicitly, exhibiting a significant contribution from the Weyl cubed term. We discuss potential cosmological implications of our results.

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D. Anninos, V. De Luca, G. Franciolini, A. Kehagias, A. Riotto. 2019-02-04. Cosmological Shapes of Higher-Spin Gravity. https://doi.org/10.1088/1475-7516%2F2019%2F04%2F045

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