Zwei-dreibein gravity: a two-frame-field model of 3D massive gravity.
We present a generally covariant and parity-invariant two-frame field ("zwei-dreibein") action for gravity in three space-time dimensions that propagates two massive spin-2 modes, unitarily, and we use Hamiltonian methods to confirm the absence of unphysical degrees of freedom. We show how zwei-dreibein gravity unifies previous "3D massive gravity" models and extends them, in the context of the AdS/CFT correspondence, to allow for a positive central charge consistent with bulk unitarity.
Centre for Theoretical Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Eric A
EA
Bergshoeff
Sjoerd
S
de Haan
Olaf
O
Hohm
Wout
W
Merbis
Paul K
PK
Townsend