主题:【原创】这得从人与宇宙的关系开始讲起(一) -- 陈经
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家园 I guess

I guess in string theory, they are talking about a fiber bundle, which has a Lorenz manifold (or just the Minkowski space) as its base, and Calabi-Yau manifold as its fiber. They may also assume that the bundle is trivial. Not very sure.

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