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arXiv 2107.09062hep-thgr-qc
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超对称指数分解

Supersymmetric indices factorize

Luca V. Iliesiu, Murat Kologlu, Gustavo J. Turiaci

摘要:

从欧几里德引力路径积分可以理解黑洞的量子力学特征的程度最近受到了极大的关注。在本文中,我们研究这个问题的超对称指数的计算。具体地说,我们主要研究了四维$\mathcal{N}=2$无规范超引力场中的带电黑洞。我们证明了超对称边界条件下的重力路径积分具有无穷多个不同角速度的Kerr-Newman经典鞍点。我们认为,费米子零模波动存在于每个这些解决方案,使他们的贡献消失,除了一个单一的鞍点,这是BPS,并给出了预期值的指数。然后,我们转向涉及时空虫洞的非微扰校正,并表明在所有这些几何中存在一个费米子零模,使它们的贡献再次消失。该机制适用于单边界和多边界路径积分。特别是,只有断开的几何没有虫洞有助于计算指数的引力路径积分,和因式分解困扰黑洞配分函数的难题是解决超对称指数。最后,我们分类所有其他的单中心几何,产生非微扰的贡献,每个边界的引力指数。

英文摘要:

The extent to which quantum mechanical features of black holes can be understood from the Euclidean gravity path integral has recently received significant attention. In this paper, we examine this question for the calculation of the supersymmetric index. For concreteness, we focus on the case of charged black holes in asymptotically flat four-dimensional $\mathcal{N}=2$ ungauged supergravity. We show that the gravity path integral with supersymmetric boundary conditions has an infinite family of Kerr-Newman classical saddles with different angular velocities. We argue that fermionic zero-mode fluctuations are present around each of these solutions making their contribution vanish, except for a single saddle that is BPS and gives the expected value of the index. We then turn to non-perturbative corrections involving spacetime wormholes and show that a fermionic zero mode is present in all these geometries, making their contribution vanish once again. This mechanism works for both single- and multi-boundary path integrals. In particular, only disconnected geometries without wormholes contribute to the gravitational path integral which computes the index, and the factorization puzzle that plagues the black hole partition function is resolved for the supersymmetric index. Finally, we classify all other single-centered geometries that yield non-perturbative contributions to the gravitational index of each boundary.

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