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arXiv 0905.4651hep-thgr-qc
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D=4中纯N=2超引力的有限维和无限维对称性

Finite and infinite-dimensional symmetries of pure N=2 supergravity in D=4

Laurent Houart, Axel Kleinschmidt, Josef Lindman Hörnlund, Daniel Persson, Nassiba Tabti

摘要:

研究了D=4时纯N=2超引力的对称性。众所周知,这个理论减少了一个Killing矢量,其特征在于非线性实现的对称性SU(2,1),它是SL(3,C)的非分裂实形式。我们考虑保半超对称性理论的BPS膜解和SU(2,1)对它们的作用。此外,我们提供的证据表明,该理论表现出一个潜在的代数结构所描述的洛伦兹Kac-Moody群SU(2,1)^{+}。这一证据既来自于D=4中N=2超引力的玻色子时空场与基于双曲群SU(2,1)^{++}的单参数σ模型之间的对应,也来自于BPS膜解的结构被整齐地编码在SU(2,1)^{+}中的事实。作为我们分析的一个很好的副产品,我们得到了卡茨-穆迪代数su(2,1)^{+}在基于膜物理的e_{11}中的正则嵌入。

英文摘要:

We study the symmetries of pure N=2 supergravity in D=4. As is known, this theory reduced on one Killing vector is characterised by a non-linearly realised symmetry SU(2,1) which is a non-split real form of SL(3,C). We consider the BPS brane solutions of the theory preserving half of the supersymmetry and the action of SU(2,1) on them. Furthermore we provide evidence that the theory exhibits an underlying algebraic structure described by the Lorentzian Kac-Moody group SU(2,1)^{+++}. This evidence arises both from the correspondence between the bosonic space-time fields of N=2 supergravity in D=4 and a one-parameter sigma-model based on the hyperbolic group SU(2,1)^{++}, as well as from the fact that the structure of BPS brane solutions is neatly encoded in SU(2,1)^{+++}. As a nice by-product of our analysis, we obtain a regular embedding of the Kac-Moody algebra su(2,1)^{+++} in e_{11} based on brane physics.

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