Betti numbers of the moduli space of rank 3 parabolic Higgs bundles

• Type: Book
• Date: 2007

Authors

Garcia Prada, O (Author) Other; Gothen, PB (Author) FCUP; Munoz, V (Author) Other

Publisher

American Mathematical Society

Providence, Rhode Island, EUA

Indexing

ISI Web of Knowledge - 12 Citations

Scopus

Scientific classification

FOS: Natural sciences > Mathematics

CORDIS: Physical sciences > Mathematics > Geometry

Associated Projects

Centro de Matemática da Universidade do Porto - Centro de Matemática da Universidade do Porto

Other information

Authenticus ID: P-008-KNY

Abstract (EN): Parabolic Higgs bundles on a Riemann surface are of interest for many reasons, one of them being their importance in the study of representations of the fundamental group of the punctured surface in the complex general linear group. In this paper we calculate the Betti numbers of the moduli space of rank 3 parabolic Higgs bundles with fixed and non-fixed determinant, using Morse theory. A key point is that certain critical submanifolds of the Morse function can be identified with moduli spaces of parabolic triples. These moduli spaces come in families depending on a real parameter and we carry out a careful analysis of them by studying their variation with this parameter. Thus we obtain in particular information about the topology of the moduli spaces of parabolic triples for the value of the parameter relevant to the study of parabolic Higgs bundles. The remaining critical submanifolds are also described: one of them is the moduli space of parabolic bundles, while the remaining ones have a description in terms of symmetric products of the Riemann surface. As another consequence of our Morse theoretic analysis, we obtain a proof of the parabolic version of a theorem of Laumon, which states that the nilpotent cone (the preimage of zero under the Hitchin map) is a Lagrangian subvariety of the moduli space of parabolic Higgs bundles.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 80

ISBN: 978-0-8218-3972-0

Collection: Memoirs of the American Mathematical Society

Vol.: 879