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arXiv 1004.0880hep-thmath-phmath.MP
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射影超空间中的非线性西格玛模型讲座

Lectures on nonlinear sigma-models in projective superspace

Sergei M. Kuzenko

摘要:

四维时空中的N = 2超对称性与超卡勒几何和四元数卡勒几何密切相关。一方面,刚性超对称西格玛模型的目标空间必然是超Kahler流形。另一方面,当耦合到N = 2的超引力时,sigma模型的目标空间必须是四元Kahler空间。众所周知,这样的流形的限制holonomy是很难产生明确的。射影超空间是构造一般N = 2超对称非线性西格玛模型的场论方法,从而产生新的超Kahler和四元数Kahler度量.针对物理学家和数学家组成的混合观众,这些讲座提供了一个教学介绍投影超空间的方法。

英文摘要:

N = 2 supersymmetry in four space-time dimensions is intimately related to hyperkahler and quaternionic Kahler geometries. On one hand, the target spaces for rigid supersymmetric sigma-models are necessarily hyperkahler manifolds. On the other hand, when coupled to N = 2 supergravity, the sigma-model target spaces must be quaternionic Kahler. It is known that such manifolds of restricted holonomy are difficult to generate explicitly. Projective superspace is a field-theoretic approach to constructing general N = 2 supersymmetric nonlinear sigma-models, and hence to generate new hyperkahler and quaternionic Kahler metrics. Intended for a mixed audience consisting of both physicists and mathematicians, these lectures provide a pedagogical introduction to the projective-superspace approach.

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