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arXiv 0710.4348hep-thcond-mat.stat-mech
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RG体流下边界熵可增加

Boundary Entropy Can Increase Under Bulk RG Flow

Daniel Green, Michael Mulligan, David Starr

摘要:

已知临界一维量子系统(或二维共形场论)的边界熵log(g)在边界理论的重整化群(RG)流下会减小.相反,我们研究的行为的边界熵的散装理论之间的两个附近的临界点流动。我们使用共形微扰理论计算的变化,由于一个稍微相关的批量扰动,并发现它没有首选的符号。因此,在适当的整体流动期间,边界熵log(g)可以增加。这在极小模型之间的流中得到了明确的证明。我们讨论了这个结果在弦论中D膜和凝聚态物质中杂质问题中的应用。

英文摘要:

The boundary entropy log(g) of a critical one-dimensional quantum system (or two-dimensional conformal field theory) is known to decrease under renormalization group (RG) flow of the boundary theory. We study instead the behavior of the boundary entropy as the bulk theory flows between two nearby critical points. We use conformal perturbation theory to calculate the change in g due to a slightly relevant bulk perturbation and find that it has no preferred sign. The boundary entropy log(g) can therefore increase during appropriate bulk flows. This is demonstrated explicitly in flows between minimal models. We discuss the applications of this result to D-branes in string theory and to impurity problems in condensed matter.

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