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Motivic classes of moduli of Higgs bundles and moduli of bundles with connections. (arXiv:1705.04890v2 [math.AG] UPDATED)
来源于:arXiv
Let X be a smooth projective curve over a field of characteristic zero. We
calculate the motivic class of the moduli stack of semistable Higgs bundles on
X. We also calculate the motivic class of the moduli stack of vector bundles
with connections by showing that it is equal to the class of the stack of
semistable Higgs bundles of the same rank and degree zero.
We follow the strategy of Mozgovoy and Schiffmann for counting Higgs bundles
over finite fields. The main new ingredient is a motivic version of a theorem
of Harder about Eisenstein series claiming that all vector bundles have
approximately the same motivic class of Borel reductions as the degree of Borel
reduction tends to $-\infty$. 查看全文>>