The finite-group equivariant VOSA conjecture

From papers

Let V\mathbb{V} be a unitary self-dual VOSA of central charge c=n/2c=n/2, equivariant under a finite group GG with anomaly k(IZΩspin~)4(BG)k\in (\widetilde{I_{\mathbb{Z}\Omega^{\mathrm{spin}}}})^4(BG). Let W\mathbb{W} be its canonically Z/2\mathbb{Z}/2-twisted module, and let k~\tilde k be the induced twist in the target KO\operatorname{KO}-theory. The finite-group equivariant VOSA conjecture. There is a class

[V]TMFGn+k(pt)[\mathbb{V}]\in \operatorname{TMF}^{n+k}_G(\mathrm{pt})

such that

Φ([V])=η(q)nWKOGn+k~((q))(pt).\Phi([\mathbb{V}])=\eta(q)^{-n}\mathbb{W}\in \operatorname{KO}^{n+\tilde k}_G((q))(\mathrm{pt}).

This extends the affine-equivariant proposal to arbitrary finite symmetry groups and incorporates the anomaly and its induced graded-Brauer twist; the required equivariant twisted TMF\operatorname{TMF} interpretation remains conjectural.

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Sources & referencesView supporting material

Primary source

Yuji Tachikawa and Mayuko Yamashita, “Anderson duality of topological modular forms and its differential-geometric manifestations”, arXiv:2305.06196 (2025).

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