Blow-ups and the quantum spectrum of surfaces

Abstract

We investigate the behavior of the spectrum of the quantum (or Dubrovin) connection of smooth projective surfaces under blow-ups. Our main result is that for small values of the parameters, the quantum spectrum of such a surface is asymptotically the union of the quantum spectrum of a minimal model of the surface and a finite number of additional points located “close to infinity”, that correspond bijectively to the exceptional divisors. This proves a conjecture of Kontsevich in the surface case.