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arXiv 1005.4433hep-th
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超对称Janus解的边界熵

Boundary entropy of supersymmetric Janus solutions

Marco Chiodaroli, Michael Gutperle, Ling-Yan Hung

摘要:

本文计算了IIB型超引力$AdS_3\times S^3\times T^4$真空的半BPS Janus形变的全息边界熵。以前的工作\cite{Chiodaroli:2009yw}已经表明,有两个独立的这种变形。在一种情况下,六维介子跨越界面跳跃,而另一种情况下显示出轴子和四形式势的跳跃。在六维玻色子跳跃的情况下,可以将全息结果与二维界面CFT的弱耦合结果进行比较,其中紧致玻色子的半径跨越界面跳跃。我们发现全息和CFT结果之间的确切协议。这与非超对称Janus解的全息计算相反,后者仅在跳跃参数的首阶与CFT结果一致。我们还研究了全息计算的影响的情况下,一个跳跃的轴子,这可以与变形的CFT的$Z_2$ -orbifold扭曲运营商的解决方案。

英文摘要:

In this paper we compute the holographic boundary entropy for half-BPS Janus deformations of the $AdS_3\times S^3\times T^4$ vacuum of type IIB supergravity. Previous work \cite{Chiodaroli:2009yw} has shown that there are two independent deformations of this sort. In one case, the six-dimensional dilaton jumps across the interface, while the other case displays a jump of axion and four-form potential. In case of a jump of the six-dimensional dilaton, it is possible to compare the holographic result with the weak-coupling result for a two-dimensional interface CFT where the radii of the compactified bosons jump across the interface. We find exact agreement between holographic and CFT results. This is to be contrasted with the holographic calculation for the non-supersymmetric Janus solution, which agrees with the CFT result only at the leading order in the jump parameter. We also examine the implications of the holographic calculation in case of a solution with a jump in the axion, which can be associated with a deformation of the CFT by the $Z_2$-orbifold twist operator.

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