二维BCFTs平均边界条件下的半经典引力
Semiclassical Gravity from Averaged Boundaries in two-dimensional BCFTs
摘要：
将半经典引力解释为CFTs的整体平均，在理解因子分解问题和信息悖论方面取得了很大进展。本文考虑二维边界共形场论（BCFTs）中边界条件的平均化。我们表明，边界平均起着重要的作用，不仅在产生虫孔的贡献，但也在解决以下问题。在AdS/BCFT的一般设置中，人们可以找到膜具有（自）相交的非物理解。我们表明，平均很好地解决了这个交叉问题。这提供了另一个证据，证明平均在再现爱因斯坦引力中起着重要作用。我们还建议，平均提供了一个BCFT对偶的岛屿模型。
英文摘要：
The interpretation of semiclassical gravity as an ensemble-average of CFTs has provided much progress in understanding the factorization problem and the information paradox. In this article, we consider an averaging over boundary conditions in two-dimensional boundary conformal field theories (BCFTs). We show that the boundary averaging plays an important role not only in producing wormhole contributions but also in resolving the following problem. In general setups in AdS/BCFT, one can find unphysical solutions where branes have (self-)intersections. We show that the averaging nicely resolves this intersection problem. This provides another piece of evidence that averaging plays an important role in reproducing Einstein gravity. We also propose that the averaging provides a BCFT dual of the island model.
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