## Geometry and Physics: Volume 2

## A Festschrift in honour of Nigel Hitchin

### Edited by **Jørgen Ellegaard Andersen**, **Andrew Dancer**, and **Oscar García-Prada**

## Table of Contents

14: Brauer group of moduli of Higgs bundles and connections, *David Baraglia (University of Adelaide), Indranil Biswas (Tata Institute of Fundamental Research), Laura Schaposnik (University Illinois at Chicago)*

15: Classification of boundary Lefschetz fibrations., *Stefan Behrens (Utrecht University), Gil Cavalcanti (Utrecht University), Ralph Klaasse (Utrecht University)*

16: SL(∞, R), Higgs bundles, and quantization, *Olivier Biquard (École Normale Supérieure)*

17: Wild character varieties, meromorphic Hitchin systems and Dynkin diagrams, *Philip Boalch (Université Paris-Sud)*

18: Irreducibility of moduli of semistable chains and applications to U(p,q)-bundles, *Steven Bradlow (University of Illinois Urbana-Champaign), Oscar Garcia-Prada (Institute
of Mathematical Sciences), Peter Gothen (University of Porto), Jochen Heinloth (University of Duisburg)*

19: Various generalisations and deformations of PSL(2,R) surface group representations and their Higgs bundles, *Brian Collier (University of Maryland)*

20: Restrictions of heterotic G_2 structures and instanton connections, *Xenia de la Ossa (University of Oxford), Magdalena Larfors (Uppsala University), Eirek Svanes (Sorbonne University, Lagrange Institute)*

21: Mixing Flows on Moduli Spaces of Flat Bundles over Surfaces, *Giovanni Forni and William Goldman (University of Maryland)*

22: Involutions of rank 2 Higgs bundle moduli spaces, *Oscar Garcia-Prada (Institute
of Mathematical Sciences, Spain), Sundararaman Ramanan (Chennai Mathematical Institute)*

23: Generalised Kahler metrics from Hamiltonian deformations, *Marco Gualtieri (University of Toronto)*

24: Stable Betti numbers of (partial) toroidal compactifications of the moduli space of Abelian varieties, *Samuel Grushevsky (Mathematics Department, Stony Brook University), Klaus Hulek (, Leibniz University at Hannover), Orsola Tommasi (Chalmers University of Technology and the University of Gothenburg), Mathieu Dutour Sikiric (Rudjer Boskovi? Institute)*

25: Spectral curves for the triple reduced product of coadjoint orbits for SU(3), *Jacques Hurtubise (, McGill University), Lisa Jeffrey (University of Toronto), Steven Rayan (University of Saskatchewan), Paul Selick (University of Toronto), Jonathan Weitsman (Northeastern University)*

26: Threefold extremal contractions of type (II A); part II, *Shigefumi Mori (Research Institute for Mathematical Sciences, Kyoto University), Yuri Prokhorov (Steklov Mathematical Institute of Russian Academy of Sciences)*

27: Parabolic Higgs bundles for real reductive Lie groups: a very basic introduction, *Ignasi Mundet i Riera (Facultat de Matemátiques i Informática, Universitat de Barcelona)*

28: Holonomic Poisson manifolds and deformations of elliptic algebras, *Brent Pym (University of Edinburgh), Travis Schedler (Imperial College London)*

29: An explicit view of the Hitchin fibration on the Betti side for P1 minus 5 points, *Carlos Simpson (Université Côte d'Azur, CNRS)*