Phys. Rev. Lett. 102, 201301 (2009) [4 pages]Massive Gravity in Three DimensionsReceived 21 January 2009; published 21 May 2009 A particular higher-derivative extension of the Einstein-Hilbert action in three spacetime dimensions is shown to be equivalent at the linearized level to the (unitary) Pauli-Fierz action for a massive spin-2 field. A more general model, which also includes “topologically-massive” gravity as a special case, propagates the two spin-2 helicity states with different masses. We discuss the extension to massive N-extended supergravity, and we present a “cosmological” extension that admits an anti–de Sitter vacuum. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.201301
DOI:
10.1103/PhysRevLett.102.201301
PACS:
04.60.Kz
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