BSU(2)上的重言式类与光滑丛
Tautological classes and smooth bundles over BSU(2)
摘要:
对李群G和光滑流形W,研究了G在W上的光滑作用与G在具有纤维W和结构群Diff(W)的分类空间上的丛的光滑作用的区别.特别地,我们证明了BSU(2)上的光滑流形丛不是由作用诱导的。实现这一目标的主要工具是一个技术结果,它给出了一个约束的重言式类的价值拉回到上同调的BSU(2)沿地图诱导的行动。
英文摘要:
For a Lie group G and a smooth manifold W, we study the difference between smooth actions of G on W and bundles over the classifying space of G with fiber W and structure group Diff(W). In particular, we exhibit smooth manifold bundles over BSU(2) that are not induced by an action. The main tool for reaching this goal is a technical result that gives a constraint for the values of tautological classes pulled back to the cohomology of BSU(2) along a map induced by an action.
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