Torsion conjecture for Chern classes of properly rigid representations

From papers

Let XX be a smooth complex quasi-projective variety with base point xx, and let

ρ:π1(Xan,x)GL(r,C)\rho:\pi_1(X^{\mathrm{an}},x)\to\operatorname{GL}(r,\mathbb C)

be a properly rigid representation with quasi-unipotent monodromy at infinity. Let (Vρ,ρ)(V_\rho,\nabla_\rho) be its associated algebraic flat vector bundle. Torsion conjecture for properly rigid representations. For every i1i\geq 1, ci(Vρ)c_i(V_\rho) is torsion in CHi(X)\operatorname{CH}^i(X).

The conjecture is motivated by the vanishing of analytic and secondary Chern classes for such representations. It would follow from the geometric-origin conjecture for rigid local systems together with the corresponding torsion statement for flat bundles of geometric origin, but remains open in general.

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Sources & referencesView supporting material

Primary source

Adrian Langer, “On algebraic Chern classes of flat vector bundles”, arXiv:2107.03127 (2021).

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