# Generators for the cohomology ring of the moduli space of rank 2 higgs bundles

Hausel T, Thaddeus M. 2004. Generators for the cohomology ring of the moduli space of rank 2 higgs bundles. Proceedings of the London Mathematical Society. 88(3), 632–658.

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Hausel, Tamas

^{IST Austria}; Thaddeus, MichaelAbstract

The moduli space of stable vector bundles on a Riemann surface is smooth when the rank and degree are coprime, and is diffeomorphic to the space of unitary connections of central constant curvature. A classic result of Newstead and Atiyah and Bott asserts that its rational cohomology ring is generated by the universal classes, that is, by the Kunneth components of the Chern classes of the universal bundle.
This paper studies the larger, non-compact moduli space of Higgs bundles, as introduced by Hitchin and Simpson, with values in the canonical bundle K. This is diffeomorphic to the space of all connections of central constant curvature, whether unitary or not. The main result of the paper is that, in the rank 2 case, the rational cohomology ring of this space is again generated by universal classes.
The spaces of Higgs bundles with values in K(n) for n > 0 turn out to be essential to the story. Indeed, we show that their direct limit has the homotopy type of the classifying space of the gauge group, and hence has cohomology generated by universal classes. 2000 Mathematics Subject Classification 14H60 (primary), 14D20, 14H81, 32Q55, 58D27 (secondary).

Publishing Year

Date Published

2004-05-01

Journal Title

Proceedings of the London Mathematical Society

Volume

88

Issue

3

Page

632 - 658

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### Cite this

Hausel T, Thaddeus M. Generators for the cohomology ring of the moduli space of rank 2 higgs bundles.

*Proceedings of the London Mathematical Society*. 2004;88(3):632-658. doi:10.1112/S0024611503014618Hausel, T., & Thaddeus, M. (2004). Generators for the cohomology ring of the moduli space of rank 2 higgs bundles.

*Proceedings of the London Mathematical Society*. Oxford University Press. https://doi.org/10.1112/S0024611503014618Hausel, Tamás, and Michael Thaddeus. “Generators for the Cohomology Ring of the Moduli Space of Rank 2 Higgs Bundles.”

*Proceedings of the London Mathematical Society*. Oxford University Press, 2004. https://doi.org/10.1112/S0024611503014618.T. Hausel and M. Thaddeus, “Generators for the cohomology ring of the moduli space of rank 2 higgs bundles,”

*Proceedings of the London Mathematical Society*, vol. 88, no. 3. Oxford University Press, pp. 632–658, 2004.Hausel, Tamás, and Michael Thaddeus. “Generators for the Cohomology Ring of the Moduli Space of Rank 2 Higgs Bundles.”

*Proceedings of the London Mathematical Society*, vol. 88, no. 3, Oxford University Press, 2004, pp. 632–58, doi:10.1112/S0024611503014618.**All files available under the following license(s):**

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