Ciocan-Fontanine–Kim higher-genus quasimap wall-crossing conjecture

Let ZZ be a complete intersection in projective space, and fix g,n0g,n\geq 0. For each effective degree β\beta, let qβq^\beta be the corresponding Novikov monomial, let Mg,nϵ(Z,β)\overline{\mathcal{M}}^{\epsilon}_{g,n}(Z,\beta) and Mg,n(Z,β)\overline{\mathcal{M}}^{\infty}_{g,n}(Z,\beta) denote the moduli spaces of ϵ\epsilon-stable and \infty-stable quasimaps, respectively, and let μβϵ(z)\mu^{\epsilon}_{\beta}(z) be the relevant coefficients of the II-function of ZZ. For a tuple β=(β1,,βk)\vec{\beta}=(\beta_1,\ldots,\beta_k), let bβb_{\vec{\beta}} convert the additional marked points to basepoints, and let cc be the contraction morphism from \infty-stable to ϵ\epsilon-stable quasimaps. Ciocan-Fontanine–Kim's higher-genus wall-crossing conjecture. One has

βqβ[Mg,nϵ(Z,β)]vir=β0,β1,,βkqβ0k!(bβ)c(i=1kqβievn+i(μβiϵ(ψn+i))[Mg,n+k(Z,β0)]vir).\sum_{\beta}q^\beta[\overline{\mathcal{M}}^{\epsilon}_{g,n}(Z,\beta)]^{\mathrm{vir}}= \sum_{\beta_0,\beta_1,\ldots,\beta_k}\frac{q^{\beta_0}}{k!}(b_{\vec{\beta}})_*c_*\left(\prod_{i=1}^kq^{\beta_i}\operatorname{ev}_{n+i}^*(\mu^{\epsilon}_{\beta_i}(-\psi_{n+i}))\cap[\overline{\mathcal{M}}^{\infty}_{g,n+k}(Z,\beta_0)]^{\mathrm{vir}}\right).

More generally, if Z=W/ ⁣/θGZ=W\mathbin{/\!/_{\theta}}G for a complex affine variety WW and a reductive algebraic group GG, there should be an explicit formula, depending only on coefficients of the II-function of ZZ, relating the virtual fundamental cycles of the moduli spaces of ϵ\epsilon-stable and \infty-stable quasimaps to ZZ. This is a proposed higher-genus extension of genus-zero quasimap wall-crossing; the displayed formula is presented as a conjecture, while the paper's abstract states that it proves the formula for complete intersections in projective space. The broader GIT-quotient formulation remains conjectural in the supplied text.

Sources & referencesView supporting material

Primary source

Emily Clader, Felix Janda and Yongbin Ruan, “Higher-genus quasimap wall-crossing via localization”, arXiv:1702.03427 (2024).

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