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arXiv 1602.05959hep-th
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对反膜势的回路修正

Loop corrections to the antibrane potential

Iosif Bena, Johan Blåbäck, David Turton

摘要:

反膜提供了将反德西特通量紧致化提升到德西特通量的一些最通用的方法,而且越来越多的证据表明,放置在长的扭曲喉道中的反膜,如克列巴诺夫-斯特拉斯勒扭曲变形锥解,具有一个排斥膜-膜的快子。这种快子最早是在反膜的反反应很大的参数范围内发现的,它的存在是从膜间势中某些项的高度非平凡的抵消推断出来的。我们使用膜有效作用量方法,类似于Michel,Mintun,Polchinski,Puhm和Saad在arXiv:1412.5702中提出的方法,当反反应很小时,分析Klebanov-Strassler中的反膜,并找到一个参数区域,其中所有对作用量的微扰贡献都可以显式计算。我们发现,在强耦合的取消也存在于弱耦合制度,我们建立其存在的所有循环。我们的计算表明,反膜世界体积理论的谱是不带隙的,并且可能普遍存在快子。因此,即使在反向反应很小的情况下,涉及反膜的提升机制仍然值得怀疑。

英文摘要:

Antibranes provide some of the most generic ways to uplift Anti-de Sitter flux compactifications to de Sitter, and there is a growing body of evidence that antibranes placed in long warped throats such as the Klebanov-Strassler warped deformed conifold solution have a brane-brane-repelling tachyon. This tachyon was first found in the regime of parameters in which the backreaction of the antibranes is large, and its existence was inferred from a highly nontrivial cancellation of certain terms in the inter-brane potential. We use a brane effective action approach, similar to that proposed by Michel, Mintun, Polchinski, Puhm and Saad in arXiv:1412.5702, to analyze antibranes in Klebanov-Strassler when their backreaction is small, and find a regime of parameters where all perturbative contributions to the action can be computed explicitly. We find that the cancellation found at strong coupling is also present in the weak-coupling regime, and we establish its existence to all loops. Our calculation indicates that the spectrum of the antibrane worldvolume theory is not gapped, and may generically have a tachyon. Hence uplifting mechanisms involving antibranes remain questionable even when backreaction is small.

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