Strong formality conjecture for the half-quantum flag variety

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Let GG be an almost-simple algebraic group with dual group Gˇ\check{G}, let qq be a chosen complex root of unity, let XqX_q be the half-quantum flag variety, let N~\widetilde{\mathcal{N}} be the Springer resolution, and let N\mathcal{N} be the nilpotent cone. Write QCoh⁡dg(Y)\operatorname{QCoh}_{\mathrm{dg}}(Y) for the derived infinity-category of quasi-coherent sheaves on YY, IndCoh⁡dg(Xq)\operatorname{IndCoh}_{\mathrm{dg}}(X_q) for the formal cocompletion of coherent dg sheaves, and Rep⁡dg(u(Gq))\operatorname{Rep}_{\mathrm{dg}}(u(G_q)) for the formal cocompletion of finite-dimensional dg representations of the small quantum group. Strong formality conjecture. There is a QCoh⁡dg(Gˇ/Bˇ)\operatorname{QCoh}_{\mathrm{dg}}(\check{G}/\check{B})-linear, fully faithful, central tensor functor

η∗:QCoh⁡dg(N~)→IndCoh⁡dg(Xq),\eta^*:\operatorname{QCoh}_{\mathrm{dg}}(\widetilde{\mathcal{N}})\to\operatorname{IndCoh}_{\mathrm{dg}}(X_q),

and a corresponding fully faithful tensor functor

QCoh⁡dg(N)→Rep⁡dg(u(Gq)).\operatorname{QCoh}_{\mathrm{dg}}(\mathcal{N})\to\operatorname{Rep}_{\mathrm{dg}}(u(G_q)).

The conjecture is motivated by the enhanced derived category of XqX_q, the computation relating its derived endomorphisms to the Springer resolution, and known formality results.

References

Primary source

Cris Negron and Julia Pevtsova, “The half-quantum flag variety and representations for small quantum groups”, arXiv:2212.12198 (2022).

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