Centre for Theoretical Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Phys Rev Lett. 2013 Sep 13;111(11):111102. doi: 10.1103/PhysRevLett.111.111102. Epub 2013 Sep 11.
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.
我们提出了一种在三维时空中具有广义协变性和宇称不变性的双框架场（"zwei-dreibein"）作用量，用于传播两种具有质量的自旋-2 模式，并通过哈密顿方法确认不存在无物理意义的自由度。我们展示了 zwei-dreibein 引力如何统一以前的“3D 有质量引力”模型，并在 AdS/CFT 对应中扩展它们，以允许具有与体内部一致性的正中心荷。
