Chern-Simons reciprocity for closed 3-manifolds with finite irreducible character variety

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Let MM be an oriented closed 33-manifold, let GG be a simply connected complex simple Lie group, and let RGirr(M)\mathrm{R}^{\rm irr}_G(M) be the character variety of irreducible representations π1(M)→G\pi_1(M)\to G. Write π0(RGirr(M))\pi_0(\mathrm{R}^{\rm irr}_G(M)) for its finite set of connected components, and let CS(ρ)∈C/Z\mathrm{CS}(\rho)\in\mathbb{C}/\mathbb{Z} be the Chern-Simons invariant. Chern-Simons reciprocity conjecture for SL2(C)\mathrm{SL}_2(\mathbb{C}). If G=SL2(C)G=\mathrm{SL}_2(\mathbb{C}) and ∣RGirr(M)∣<∞|\mathrm{R}^{\rm irr}_G(M)|<\infty, then cG=24c_G=24 and

24∑[ρ]∈π0(RGirr(M))CS(ρ)=0in C/Z.24\sum_{[\rho]\in\pi_0(\mathrm{R}^{\rm irr}_G(M))}\mathrm{CS}(\rho)=0\quad\text{in }\mathbb{C}/\mathbb{Z}.

This is the paper's stated result in the SL2(C)\mathrm{SL}_2(\mathbb{C}) case, while the preceding problem asks for a general integer cGc_G and a topological interpretation of the resulting residue. The supplied status is unknown, so the database records it as open.

References

Primary source

Takefumi Nosaka, “Reciprocity of the Chern-Simons invariants of 3-manifolds”, arXiv:2212.07569 (2022).

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