Universal Families on moduli spaces of principal bundles on curves

Details Universal Families on moduli spaces of principal bundles on curves Universal Families on moduli spaces of principal bundles on curves

2006-01-09

arxiv.org/abs/math/0601168v1

Mathematics

Algebraic Geometry

Scientific paper

Let $H$ be a connected semisimple linear algebraic group defined over $\mathbb C$ and $X$ a compact connected Riemann surface of genus at least three. Let ${\mathcal M}'_X(H)$ be the moduli space parametrising all topologically trivial stable principal $H$-bundles over $X$ whose automorphism group coincides with the centre of $H$. It is a Zariski open dense subset of the moduli space of stable principal $H$-bundles. We prove that there is a universal principal $H$-bundle over $X\times {\mathcal M}'_X(H)$ if and only if $H$ is an adjoint group (that is, the centre of $H$ is trivial).

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