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arXiv 1408.3418hep-thgr-qc
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R^3 x S^1上超引力的量子动力学

Quantum Dynamics of Supergravity on R^3 x S^1

David Tong, Carl Turner

摘要:

我们研究了四维空间中N=1超引力的量子动力学。超对称性确保了对圆上卡西米尔能量的微扰贡献被抵消。然而,瞬子贡献仍然存在。这些使圆上的超对称紧化不稳定,背景动态地解紧回到四维。这个计算为欧几里德量子引力中的一些旧思想提供了一个试验场。特别是,我们表明,引力瞬子与一个新的,红外线规模自然是指数抑制相对于普朗克尺度和所产生的对数运行的高斯-邦纳长期。还有一些有趣的技术细节,包括在自对偶引力瞬子的背景下,玻色子和费米子决定子的非抵消,尽管存在超对称性。

英文摘要:

We study the quantum dynamics of N=1 supergravity in four dimensions with a compact spatial circle. Supersymmetry ensures that the perturbative contributions to the Casimir energy on the circle cancel. However, instanton contributions remain. These render supersymmetric compactification on a circle unstable and the background dynamically decompactifies back to four dimensions. The calculation provides a testing ground for some old ideas in Euclidean quantum gravity. In particular, we show that gravitational instantons are associated to a new, infra-red scale which is naturally exponentially suppressed relative to the Planck scale and arises from the logarithmic running of the Gauss-Bonnet term. There are also some interesting technical details, including the non-cancellation of bosonic and fermionic determinants around the background of a self-dual gravitational instanton, despite the existence of supersymmetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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