Zwei-Dreibein Gravity

Abstract

We present a generally-covariant and parity-invariant "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.

5 pages, v2: refs. added, to appear in PRL, v3: addendum included to correct statement about absence of Boulware-Deser ghosts, and to show how this problem is solved by a restriction of parameters; main conclusion about compatibility of bulk and boundary unitarity is unaffected

References in corpus (8)

• Resummation of Massive Gravity
• Massive Gravity in Three Dimensions
• More on Massive 3D Gravity
• Interacting Spin-2 Fields
• Acausality of Massive Gravity
• Massive Gravity Acausality Redux
• The Boulware-Deser mode in Zwei-Dreibein gravity
• No consistent bimetric gravity?

Cited by in corpus (59)

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• Aspects of three-dimensional higher-curvature gravities
• (2+1)-dimensional interacting model of two massless spin-2 fields as a bi-gravity model