title: Massive gravity in three dimensions.
abstract: 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.
authors.affiliation: Centre for Theoretical Physics, University of Groningen, 9747 AG Groningen, The Netherlands.
authors.forename: Eric A
authors.initials: EA
authors.lastname: Bergshoeff
authors.forename: Olaf
authors.initials: O
authors.lastname: Hohm
authors.forename: Paul K
authors.initials: PK
authors.lastname: Townsend