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arxiv: 1001.2287 · v1 · submitted 2010-01-13 · 🌀 gr-qc · astro-ph.CO· hep-th

The Jebsen-Birkhoff theorem in alternative gravity

classification 🌀 gr-qc astro-ph.COhep-th
keywords gravitytheoremjebsen-birkhoffscalar-tensoralternativeapparentappliedblack
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We discuss the validity, or lack thereof, of the Jebsen-Birkhoff theorem in scalar-tensor theories by generalizing it and regarding the Brans-Dicke-like scalar as effective matter. Both the Jordan and Einstein frames are discussed and an apparent contradiction between static spherical solutions of scalar-tensor gravity and Hawking's theorem on Brans-Dicke black holes is clarified. The results are applied to metric and Palatini f(R) gravity.

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