Abstract
In this paper we construct arbitrarily large families of smooth projective varieties and closed Riemannian manifolds that share many algebraic and analytic invariants. For instance, every non-arithmetic, closed hyperbolic 3-manifold admits arbitrarily large collections of non-isometric finite covers which are strongly isospectral, length isospectral, and have isomorphic integral cohomology where the isomorphisms commute with restriction and co-restriction. We can also construct arbitrarily large collections of pairwise non-isomorphic smooth projective surfaces where these isomorphisms in cohomology are natural with respect to Hodge structure or as Galois modules. In particular, the projective varieties have isomorphic Picard and Albanese varieties, and they also have isomorphic effective Chow motives. Our construction employs an integral refinement of the Gassman–Sunada construction that has recently been utilized by D. Prasad. One application of our work shows the non-injectivity of the map from the Grothendieck group of varieties over \(\overline{\mathbf {Q}}\) to the Grothendieck group of the category of effective Chow motives. We also answer a question of D. Prasad.
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Acknowledgements
The authors would like to thank Nick Miller, Deepam Patel, Alan Reid, and Matthew Stover for conversations on the topics in this paper. We would also like to thank the referee for helpful comments that helped improve the clarify of the article. The first author was partially supported by an NSF Grant. The third author was partially supported by NSF Grant DMS-1408458.
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Arapura, D., Katz, J., McReynolds, D.B. et al. Integral Gassman equivalence of algebraic and hyperbolic manifolds. Math. Z. 291, 179–194 (2019). https://doi.org/10.1007/s00209-018-2077-2
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DOI: https://doi.org/10.1007/s00209-018-2077-2