Pullback of parabolic bundles and covers of ${\mathbb P}^1\setminus\{0,1,\infty\}$

Details Pullback of parabolic bundles and covers of ${\mathbb P}^1\setminus\{0,1,\infty\}$ Pullback of parabolic bundles and covers of ${\mathbb P}^1\setminus\{0,1,\infty\}$

2010-09-18

arxiv.org/abs/1009.3595v1

Mathematics

Algebraic Geometry

25 pages

Scientific paper

We work over an algebraically closed ground field of characteristic zero. A $G$-cover of ${\mathbb P}^1$ ramified at three points allows one to assign to each finite dimensional representation $V$ of $G$ a vector bundle $\oplus \mathscr{O}(s_i)$ on ${\mathbb P}^1$ with parabolic structure at the ramification points. This produces a tensor functor from representation of $G$ to vector bundles with parabolic structure that characterises the original cover. This work attempts to describe this tensor functor in terms of group theoretic data. More precisely, we construct a pullback functor on vector bundles with parabolic structure and describe the parabolic pullback of the previously described tensor functor.

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