别再裸用 Claude Code 了！32 个亲测Skills + 8 个 MCP，开发效率直接拉满！

We analyze a new MacDowell-Mansouri $R^2$-type supergravity action based on the superalgebra Osp(1|8). This contribution summarizes the work of hep-th/9702052.

We introduce an N=8 supersymmetric extension of the Bogomolny-type model for Yang-Mills-Higgs fields in 2+1 dimensions related with twistor string theory. It is shown that this model is equivalent to an N=8 supersymmetric U(n) chiral model in 2+1 dimensions with a Wess-Zumino-Witten-type term. Further reduction to 1+1 dimensions yields N=(8,8) supersymmetric extensions of the standard U(n) chiral model and Grassmannian sigma models.