Equivariant Milnor map conjecture

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Let TkT^k be the kk-torus and let Z2k\mathbb{Z}_2^k be its real subgroup. Write Ω2∗U,Tk\Omega^{U,T^k}_{2*} and Ω2∗U,Z2k\Omega^{U,\mathbb{Z}_2^k}_{2*} for the unitary equivariant bordism groups, and Ω∗O,Z2k\Omega^{O,\mathbb{Z}_2^k}_{*} for the unoriented equivariant bordism group. Equivariant Milnor map conjecture. Whenever GG is either TT or Z2\mathbb{Z}_2, there exists an equivariant Milnor map

μGk:Ω2∗U,Gk→Ω∗O,Z2k\mu^{G^k}: \Omega^{U,G^k}_{2*} \to \Omega^{O,\mathbb{Z}_2^k}_{*}

reducing the dimension by a half, defined as the real points of smooth complex generators, which is moreover surjective. This conjecture proposes an equivariant generalization of the Milnor map and would relate unitary equivariant bordism to unoriented equivariant bordism through real points of smooth complex generators. The source presents preliminary results in this direction but does not establish the conjecture.

References

Primary source

Mathilda Campillo, Yuanxin Guan, Zhi Lü and Bernardo Uribe, “Equivariant Milnor map”, arXiv:2606.12697 (2026).

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