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arXiv 1503.07488hep-thgr-qc
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三维体元和边界酉引力:MMG $_2$

Bulk and Boundary Unitary Gravity in 3D: MMG$_2$

Bayram Tekin

摘要:

我们在2+1维中构造了一个大质量自旋2理论,它不受反德西特空间中的体边界幺正性冲突的影响,因此适合于全息。该理论是拓扑大质量引力的扩展,就像最近发现的最小大质量引力(MMG)一样,但它有两个大质量螺旋度模式而不是一个。该理论允许TMG的所有解与一个重新定义的拓扑参数。我们计算的夏皮罗时间延迟,并表明,平面空间(本地)的因果关系不违反。我们发现,在我们提出的理论(我们称之为MMG $_2$),MMG和早期的新质量引力(NMG)之间存在着一种有趣的关系:即,这些理论的场方程是非平凡相关的。研究了与引力对偶的共形场论的体激发和边界电荷。我们还找到了手征重力极限,在该极限下,其中一个大质量模式变得无质量。该模型的优点是,人们不必去手征极限,以实现统一的体积和边界上和对数项,出现在手征极限和不稳定性不存在的一般理论。

英文摘要:

We construct a massive spin-2 theory in 2+1 dimensions that is immune to the bulk-boundary unitarity conflict in anti-de Sitter space and hence amenable to holography. The theory is an extension of Topologically Massive Gravity, just like the recently found Minimal Massive Gravity (MMG), but it has two massive helicity modes instead of a single one. The theory admits all the solutions of TMG with a redefined topological parameter. We calculate the Shapiro time-delay and show that flat-space (local) causality is not violated. We show that there is an interesting relation between the theory we present here (which we call MMG$_2$), MMG and the earlier New Massive Gravity (NMG): Namely, field equations of these theories are non-trivially related. We study the bulk excitations and boundary charges of the conformal field theory that could be dual to gravity. We also find the chiral gravity limit for which one of the massive modes becomes massless. The virtue of the model is that one does not have to go to the chiral limit to achieve unitarity in the bulk and on the boundary and the log-terms that appear in the chiral limit and cause instability do not exist in the generic theory.

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