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arXiv 0711.0441hep-thmath.RA
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卡茨-穆迪代数的广义共形实现

Generalized conformal realizations of Kac-Moody algebras

Jakob Palmkvist

摘要:

给出了一个构造,它将一个正整数n标记的卡茨-穆迪代数的无穷序列与一个Jordan代数相关联.对于n=1,这简化为众所周知的Kantor-Koecher-Tits构造。我们的推广利用了不同的广义约旦三元系之间的一个新的关系,连同他们已知的连接约旦和李代数。应用于除代数R,C,H,O上的Hermitian 3 × 3矩阵的Jordan代数,给出了n=2的例外李代数f4,e6,e7,e8.此外,我们得到了它们的无限维扩展n大于或等于3。在2x2矩阵的情况下,所得到的李代数的形式为so(p+n,q+n),并且伴随的非线性实现推广了签名为(p,q)的时空中的共形变换。

英文摘要:

We present a construction which associates an infinite sequence of Kac-Moody algebras, labeled by a positive integer n, to one single Jordan algebra. For n=1, this reduces to the well known Kantor-Koecher-Tits construction. Our generalization utilizes a new relation between different generalized Jordan triple systems, together with their known connections to Jordan and Lie algebras. Applied to the Jordan algebra of hermitian 3x3 matrices over the division algebras R, C, H, O, the construction gives the exceptional Lie algebras f4, e6, e7, e8 for n=2. Moreover, we obtain their infinite-dimensional extensions for n greater or equal to 3. In the case of 2x2 matrices the resulting Lie algebras are of the form so(p+n,q+n) and the concomitant nonlinear realization generalizes the conformal transformations in a spacetime of signature (p,q).

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