Zwei-Dreibein Gravity
Eric A. Bergshoeff, Sjoerd de Haan, Olaf Hohm, Wout Merbis, Paul K., Townsend

TL;DR
This paper introduces a new three-dimensional gravity model called zwei-dreibein gravity, which unifies previous models, propagates two massive spin-2 modes unitarily, and aligns with the AdS/CFT correspondence.
Contribution
It presents a generally-covariant, parity-invariant action for 3D gravity that propagates two massive modes and extends previous models within the AdS/CFT framework.
Findings
Unitarily propagates two massive spin-2 modes
Unifies and extends previous 3D massive gravity models
Allows for a positive central charge in AdS/CFT context
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.
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