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arXiv 1807.08443hep-thgr-qc
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Kerr-Schild双场论与经典双拷贝

Kerr-Schild Double Field Theory and Classical Double Copy

Kanghoon Lee

摘要:

Kerr-Schild(KS)形式是构造广义相对论精确解的有力工具。在本文中,我们提出了一个推广的传统KS形式主义的双重场论(DFT)和超引力。我们引入了一个广义KS矩阵的广义度量的零向量对。将这一结果应用于DFT的运动方程,构造了广义KS场方程。而广义KS方程是二次的领域,我们表明,它是可能的,只考虑线性方程组的解决方案。在此基础上,我们构造了一个Killing旋量方程。基于这种形式主义,我们表明,经典的双拷贝结构,这代表的解决方案的爱因斯坦方程的麦克斯韦方程的解决方案,可以扩展到整个无质量的字符串NS-NS部门。我们提出了一个超对称的经典的双副本,这表明Killing旋量方程的解决方案可以实现的超对称麦克斯韦理论的BPS方程的解决方案。

英文摘要:

The Kerr-Schild (KS) formalism is a powerful tool for constructing exact solutions in general relativity. In this paper, we present a generalization of the conventional KS formalism to double field theory (DFT) and supergravities. We introduce a generalized KS ansatz for the generalized metric in terms of a pair of null vectors. Applying this ansatz to the equations of motion of DFT, we construct the generalized KS field equation. While the generalized KS equations are quadratic in the fields, we show that it is possible to find solutions by considering linear equations only. Furthermore, we construct a Killing spinor equation under the generalized KS ansatz. Based on this formalism, we show that the classical double copy structure, which represents solutions of the Einstein equation in terms of solutions of the Maxwell equation, can be extended to the entire massless string NS-NS sector. We propose a supersymmetric classical double copy which shows that solutions of the Killing spinor equation can be realized in terms of solutions of the BPS equation of the supersymmetric Maxwell theory.

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