Einstein supergravity amplitudes from twistor-string theory
Einstein supergravity amplitudes from twistor-string theory
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来自扭弦理论的爱因斯坦超重力振幅
DOI：
10.1088/0264-9381/29/14/145010
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发表时间：
2012
影响因子：
3.5
通讯作者：
L. Mason
中科院分区：
文献类型：
--
作者：
T. Adamo;L. Mason
本文给出了和4的所有爱因斯坦（超）引力树振幅的扭弦公式。给出了有和没有宇宙常数的公式，以及各种可能的测量。利用Maldacena的观测结果证明了公式的正确性，即具有爱因斯坦波函数和非零宇宙常数的共形引力树振幅将正确地给出爱因斯坦树振幅。这证明了爱因斯坦引力振幅的构造是从扭弦理论出发的，并通过要求MHV度和杨-米尔斯有理曲线的度之间的标准关系而扩展到;这系统地排除了虚假的共形超引力贡献。为了进行比较，使用BCFW递归来获得具有超对称性（有和没有宇宙学常数）的振幅的0度和1度（反MHV和MHV）的类扭弦公式。
This paper gives a twistor-string formulation for all tree amplitudes of Einstein (super-)gravities for and 4. Formulae are given with and without cosmological constant and with various possibilities for the gauging. The formulae are justified by use of Maldacena's observation that conformal gravity tree amplitudes with Einstein wavefunctions and non-zero cosmological constant will correctly give the Einstein tree amplitudes. This justifies the construction of Einstein gravity amplitudes at from twistor-string theory and is extended to by requiring the standard relation between the MHV-degree and the degree of the rational curve for Yang–Mills; this systematically excludes the spurious conformal supergravity gravity contributions. For comparison, BCFW recursion is used to obtain twistor-string-like formulae at degree 0 and 1 (anti-MHV and MHV) for amplitudes with supersymmetry with and without cosmological constant.
影响因子：
5.4
作者：
L. Mason;David Skinner
通讯作者：
L. Mason;David Skinner