Cosmological Shapes of Higher-Spin Gravity
  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.
