Chow-theoretic Chern class conjecture for Lie-irreducible representations

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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 Lie irreducible with quasi-unipotent monodromy at infinity. Let (Vρ,∇ρ)(V_\rho,\nabla_\rho) be the associated algebraic flat vector bundle. Lie-irreducible Chern class conjecture. For every i≥2i\geq 2,

rici(Vρ)=(ri)c1(Vρ)iin CH⁡i(X)Q.r^i c_i(V_\rho)=\binom{r}{i}c_1(V_\rho)^i\quad\text{in }\operatorname{CH}^i(X)_{\mathbb Q}.

In particular, if the image of ρ\rho is contained in SL⁡(r,C)\operatorname{SL}(r,\mathbb C), then ci(Vρ)c_i(V_\rho) is torsion in CH⁡i(X)\operatorname{CH}^i(X) for every i≥2i\geq 2. This is suggested by results for rank two representations and remains open in general.

References

Primary source

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

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