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arXiv 1012.3740hep-th
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AdS_5 × S^5中的半经典四点函数

Semiclassical four-point functions in AdS_5 x S^5

E. I. Buchbinder, A. A. Tseytlin

摘要:

考虑两个具有大量子数的“重”顶点算符和两个“轻”算符的四点关联子的半经典极限(大弦张力~ λ^1/2).它可以用因式分解的形式写成两个三点函数的乘积,每个三点函数都由积分的“轻”顶点算子在由“重”算子确定的经典弦解上给出。我们检查一致性的情况下,这种因式分解的相关器与两个“轻”运营商的trons。我们详细研究的例子,当所有4个运营商手征初级标量,其中两个携带大电荷J的订单弦张力。在大的J限制,这个相关器是近极值。它的半经典表达,的确,被发现是一致的一般保护形式预期的极值相关。我们明确表明,我们的半经典结果匹配的大J极限的已知的自由N=4 SYM相关4手征主运营商与收费J,-J,2,-2,我们还比较它与现有的超引力表达式。作为一个例子的4点函数与两个非BPS的“重”运营商,我们考虑的情况下,当后者是代表折叠自旋与大AdS自旋和两个“轻”状态是手性初级标量。

英文摘要:

We consider a semiclassical (large string tension ~ λ^1/2) limit of 4-point correlator of two "heavy" vertex operators with large quantum numbers and two "light" operators. It can be written in a factorized form as a product of two 3-point functions, each given by the integrated "light" vertex operator on the classical string solution determined by the "heavy" operators. We check consistency of this factorization in the case of a correlator with two dilatons as "light" operators. We study in detail the example when all 4 operators are chiral primary scalars, two of which carry large charge J of order of string tension. In the large J limit this correlator is nearly extremal. Its semiclassical expression is, indeed, found to be consistent with the general protected form expected for an extremal correlator. We demonstrate explicitly that our semiclassical result matches the large J limit of the known free N=4 SYM correlator for 4 chiral primary operators with charges J,-J,2,-2; we also compare it with an existing supergravity expression. As an example of a 4-point function with two non-BPS "heavy" operators, we consider the case when the latter are representing folded spinning with large AdS spin and two "light" states being chiral primary scalars.

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