Holomorphic Witten instanton complexes on stratified pseudomanifolds with K\"ahler wedge metrics

We construct Witten instanton complexes for K\"ahler Hamiltonian Morse functions on stratified pseudomanifolds with wedge K\"ahler metrics satisfying a local conformally totally geodesic condition. We use this to extend Witten's holomorphic Morse inequalities for the L² cohomology of Dolbeault complexes, deriving versions for Poincar\'e Hodge polynomials, the spin Dirac and signature complexes for which we prove rigidity results, in particular establishing the rigidity of L² de Rham cohomology for these circle actions. We generalize formulas studied by Witten and Gibbons-Hawking for the equivariant signature and extend formulas used to compute NUT charges of gravitational instantons. We discuss conjectural inequalities extending known Lefschetz-Riemann-Roch formulas for other cohomology theories including those of Baum-Fulton-Quart. As far as the author is aware this article contains the first extension of Witten's holomorphic Morse inequalities to singular spaces, and the first results on rigidity of L² de Rham and Dolbeault cohomology for the actions studied on stratified pseudomanifolds