Boundary Terms and Junction Conditions for Generalized Scalar-Tensor Theories

Abstract

We compute the boundary terms and junction conditions for Horndeski's panoptic class of scalar-tensor theories, and write the bulk and boundary equations of motion in explicitly second order form. We consider a number of special subclasses, including galileon theories, and present the corresponding formulae. Our analysis opens up of the possibility of studying tunnelling between vacua in generalized scalar-tensor theories, and braneworld dynamics. The latter follows because our results are independent of spacetime dimension.

13 pages, Equation corrected. Thanks to Tsutomu Kobayashi for informing us of the typo

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