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arXiv 2007.07234hep-th
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AdS $_3\times$ S $^3$上的Ambitwistor弦和散射方程

Ambitwistor Strings and the Scattering Equations on AdS$_3\times$S$^3$

Kai Roehrig, David Skinner

摘要:

我们构造了一个描述AdS $_3\times$ S $^3$上的II型超引力的ambitwistor弦,它具有纯NS通量。背景爱因斯坦方程确保模型是无异常的。光谱由围绕这个背景的超重力波动组成,没有更高的弦状态。该理论将计算AdS $_3$上$n$点树级振幅的问题转化为理解一个$\mathfrak{sl}_2$ Gaudin可积系统的问题,该系统的表示由对偶边界算子确定,其谱参数对应于世界表插入点。散射方程采用与平坦空间类似的形式,其中$n(n-3)/2$参数$τ_{ij}$参数化Gaudin模型的本征值。

英文摘要:

We construct an ambitwistor string that describes Type II supergravity on AdS$_3\times$S$^3$ with pure NS flux. The background Einstein equations ensure that the model is anomaly free. The spectrum consists of supergravity fluctuations around this background, with no higher string states. This theory transforms the problem of computing $n$-point tree-level amplitudes on AdS$_3$ into that of understanding an $\mathfrak{sl}_2$ Gaudin integrable system, whose representations are determined by the dual boundary operators and whose spectral parameters correspond to the worldsheet insertion points. The scattering equations take a similar form to flat space, with $n(n-3)/2$ parameters $τ_{ij}$ parametrizing the eigenvalues of the Gaudin model.

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