For lci subvarieties of a smooth variety, spectral Hirzebruch-Milnor classes vanish between bounds set by the minimal exponent, yielding homological criteria for higher singularities.
A generalized Verdier-type Riemann-Roch theorem for Chern-Schwartz-MacPherson classes
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abstract
We give a general formula for the defect appearing in the Verdier-type Riemann-Roch formula for Chern-Schwartz-MacPherson classes in the case of a regular embedding. Our proof of this formula uses the constructible function version of Verdier's specialization functor, together with a specialization property of Chern-Schwartz-MacPherson classes and the corresponding Riemann-Roch theorem for smooth morphisms. As a very special case we get a formula for the Milnor-class of a local complete intersection in a smooth manifold, which in the case of a hypersurface gives back a result of Parusinski-Pragacz.
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Hirzebruch-Milnor classes of local complete intersections, minimal exponent, and applications to higher singularities
For lci subvarieties of a smooth variety, spectral Hirzebruch-Milnor classes vanish between bounds set by the minimal exponent, yielding homological criteria for higher singularities.