Arithmetic harmonic analysis on character and quiver varieties II
  We study connections between the topology of generic character varieties of fundamental groups of punctured Riemann surfaces, Macdonald polynomials, quiver representations, Hilbert schemes on surfaces, modular forms and multiplicities in tensor products of irreducible characters of finite general linear groups. 
Tamas Hausel, Emmanuel Letellier, Fernando Rodriguez-Villegas
math.RT math.AG