On intersection cohomology with torus action of complexity one, II

This paper establishes that the decomposition theorem components for contraction maps of torus actions of complexity one are intersection cohomology complexes of even codimensional subvarieties, leading to the vanishing of odd-dimensional intersection cohomology for rational complete varieties of this type and providing explicit formulas for the Betti numbers of affine trinomial hypersurfaces based on their defining equations.

Marta Agustin Vicente, Narasimha Chary Bonala, Kevin Langlois2026-03-10🔢 math