For any maximal surface group representation into SO0(2, n+1), we introduce a non-degenerate scalar product on the first cohomology group of the surface with values inthe associated flat bundle. In particular, it gives rise to a non-degene Riemannian metric on the smooth locus of the subset consisting of maximal representations inside the character variety. In the case n = 2 we prove that the Riemannian metric is compatible with the orbifold structure and we compute its restriction to the Fuchsian locus, instead, when n = 3, we show the existence of totally geodesic sub-varieties. Finally, in the general case, we explain when a representation with Zariski closure contained in SO0(2, 3)represents a smooth or orbifold point in the maximal SO0(2, n+1)-character variety and we discuss about the inclusion of Hitchin and Gothen components.

Riemannian geometry of maximal surface group representations acting on pseudo-hyperbolic space / Rungi, Nicholas. - In: MATHEMATISCHE ANNALEN. - ISSN 0025-5831. - (2024). [10.1007/s00208-024-03026-0]

Riemannian geometry of maximal surface group representations acting on pseudo-hyperbolic space

Rungi, Nicholas
2024-01-01

Abstract

For any maximal surface group representation into SO0(2, n+1), we introduce a non-degenerate scalar product on the first cohomology group of the surface with values inthe associated flat bundle. In particular, it gives rise to a non-degene Riemannian metric on the smooth locus of the subset consisting of maximal representations inside the character variety. In the case n = 2 we prove that the Riemannian metric is compatible with the orbifold structure and we compute its restriction to the Fuchsian locus, instead, when n = 3, we show the existence of totally geodesic sub-varieties. Finally, in the general case, we explain when a representation with Zariski closure contained in SO0(2, 3)represents a smooth or orbifold point in the maximal SO0(2, n+1)-character variety and we discuss about the inclusion of Hitchin and Gothen components.
2024
10.1007/s00208-024-03026-0
https://arxiv.org/abs/2309.09351
Rungi, Nicholas
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/142455
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