Abstract
We study the behavior of Hodge-genera under algebraic maps. We prove that the motivic \({\chi^c_y}\) -genus satisfies the “stratified multiplicative property”, which shows how to compute the invariant of the source of a morphism from its values on varieties arising from the singularities of the map. By considering morphisms to a curve, we obtain a Hodge-theoretic version of the Riemann–Hurwitz formula. We also study the monodromy contributions to the \({\chi_y}\) -genus of a family of compact complex manifolds, and prove an Atiyah–Meyer type formula in the algebraic and analytic contexts. This formula measures the deviation from multiplicativity of the \({\chi_y}\) -genus, and expresses the correction terms as higher-genera associated to the period map; these higher-genera are Hodge-theoretic extensions of Novikov higher-signatures to analytic and algebraic settings. Characteristic class formulae of Atiyah–Meyer type are also obtained by making use of Saito’s theory of mixed Hodge modules.
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A. Libgober was partially supported by an NSF grant. S. Cappell and J. Shaneson were partially supported by grants from DARPA. L. Maxim was partially supported by a grant from the NYU Research Challenge Fund and a PSC-CUNY Research Award.
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Cappell, S.E., Libgober, A., Maxim, L.G. et al. Hodge genera of algebraic varieties, II. Math. Ann. 345, 925–972 (2009). https://doi.org/10.1007/s00208-009-0389-6
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DOI: https://doi.org/10.1007/s00208-009-0389-6