Phys. Rev. D 36, 392–396 (1987)Higher-derivative gravity, surface terms, and string theoryReceived 26 February 1987; published in the issue dated 15 July 1987 We consider adding Euler densities to the Einstein action as new gravity interactions in higher-dimensional theories. When the appropriate surface terms are included, the surface geometry is sufficient data for the boundary-value problem associated with the new Lagrangians. We also discuss the relevance of such interactions in the context of string theory. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.36.392
DOI:
10.1103/PhysRevD.36.392
PACS:
11.10.Kk, 04.20.Fy, 11.17.+y
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