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arXiv 0807.0389hep-th
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双圈极大超引力的模性质及其与弦论的联系

Modular properties of two-loop maximal supergravity and connections with string theory

Michael B. Green, Jorge G. Russo, Pierre Vanhove

摘要:

考虑在圆和双环面上紧化的11维超引力中双圈四引力子散射振幅的低动量展开,直到S ^6R ^4阶项(其中S是Mandelivery不变量,R是线性化的Weyl曲率)。在环面紧化的情况下,低能展开式中每一项的系数一般是环面复杂结构的SL(2,Z)不变函数的数目之和。每个这样的函数满足一个单独的泊松方程的模空间与特定的源项是双线性的系数较低的顺序条款,符合定性参数的基础上超对称。与低能量的第二类弦论在十维和九维的扩展。虽然弦振幅的详细行为一般不会被超重力微扰理论再现到所有的阶数,但对于这里考虑的项,我们发现与弦微扰理论的直接结果一致。这些结果指出了一个迷人的模式,相互关联的泊松方程的IIB系数在高阶的动量膨胀,这可能有一个意义超出了特定的方法,他们的动机。

英文摘要:

The low-momentum expansion of the two-loop four-graviton scattering amplitude in eleven-dimensional supergravity compactified on a circle and a two-torus is considered up to terms of order S^6R^4 (where S is a Mandelstam invariant and R is the linearized Weyl curvature). In the case of the toroidal compactification the coefficient of each term in the low energy expansion is generically a sum of a number of SL(2,Z)-invariant functions of the complex structure of the torus. Each such function satisfies a separate Poisson equation on moduli space with particular source terms that are bilinear in coefficients of lower order terms, consistent with qualitative arguments based on supersymmetry. Comparison is made with the low-energy expansion of type II string theories in ten and nine dimensions. Although the detailed behaviour of the string amplitude is not generally expected to be reproduced by supergravity perturbation theory to all orders, for the terms considered here we find agreement with direct results from string perturbation theory. These results point to a fascinating pattern of interrelated Poisson equations for the IIB coefficients at higher orders in the momentum expansion which may have a significance beyond the particular methods by which they were motivated.

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