Sala, FrancescoTortella, Pietro2010-05-282011-09-072010-05-282011-09-072010-05-28https://openscience.sissa.it/handle/1963/3868We give a `geometrical' construction of an action of a Heisenberg algebra on the homology of the moduli spaces of torsion free sheaves on a complex smooth connected projective surface, framed along a smooth connected genus zero curve. This result generalizes Nakajima's construction for the Hilbert schemes of points.517349 bytesapplication/pdfen-USPreprint