O. Schiffmann

collaborators

3 papers

math.AG2026

Coherent sheaves on surfaces, COHAs and deformed $W_{1 + \infty}$ -algebras

Anton Mellit, Alexandre Minets, Olivier Schiffmann +1

We compute the cohomological Hall algebra of zero-dimensional sheaves on an arbitrary smooth quasi-projective surface $S$ with pure cohomology, deriving an explicit presentation by…

math.RT2024

The Langlands formula and perverse sheaves

Mikhail Kapranov, Vadim Schechtman, Olivier Schiffmann +1

For a complex reductive Lie algebra $g$ with Cartan subalgebra $h$ and Weyl group $W$ we consider the category $Perv (W \ h)$ of per…

math.RT2024

Shuffle algebras for quivers as quantum groups

Andrei NeguÅ£, Francesco Sala, Olivier Schiffmann

We define a quantum loop group $U_{Q}^{+}$ associated to an arbitrary quiver $Q = (I, E)$ and maximal set of deformation parameters, with generators indexed by $I \times \mathbb{…

Coherent sheaves on surfaces, COHAs and deformed W1+∞​-algebras

The Langlands formula and perverse sheaves

Shuffle algebras for quivers as quantum groups

Coherent sheaves on surfaces, COHAs and deformed $W_{1 + \infty}$ -algebras