Generalized local-orbifold conjecture for normal crossing divisors

Let XX be a smooth projective variety, let D=D1++DnD=D_1+\cdots+D_n be an effective reduced normal crossing divisor with smooth, irreducible, nef components, and let I1,,ImI_1,\ldots,I_m partition {1,,n}\{1,\ldots,n\} with iIjDi\bigcap_{i\in I_j}D_i\neq\varnothing. Let XD,rX_{D,\vec r} be the associated multi-root stack, and let FF denote the morphism from the relevant orbifold stable-map moduli space to the moduli space of stable maps to i=1nOX(Di)\bigoplus_{i=1}^n\mathcal O_X(-D_i). For a curve class β\beta, set di:=Diβ>0d_i:=D_i\cdot\beta>0. Generalized local-orbifold conjecture. When the rir_i are sufficiently large,

[(j=1mevj(iIjDi))M0,m(i=1nOX(Di),β)]vir=(i=1n(1)di1)F[M0,0,{(di)}iI1,,{(di)}iIm(XD,r,β)]vir.\left[\left(\bigcup_{j=1}^m\operatorname{ev}_j^*\left(\bigcup_{i\in I_j}D_i\right)\right)\cap\overline{\mathcal M}_{0,m}\left(\bigoplus_{i=1}^n\mathcal O_X(-D_i),\beta\right)\right]^{\operatorname{vir}} =\left(\prod_{i=1}^n(-1)^{d_i-1}\right)F_*[\overline{\mathcal M}_{0,0,\{(d_i)\}_{i\in I_1},\ldots,\{(d_i)\}_{i\in I_m}}(X_{D,\vec r},\beta)]^{\operatorname{vir}}.

This conjecture relates local invariants to orbifold invariants of multi-root stacks. The paper proposes it because the relevant local mirror theorem is known, whereas a mirror theorem for logarithmic Gromov–Witten invariants is not; the large-root condition is essential.

Sources & referencesView supporting material

Primary source

Hsian-Hua Tseng and Fenglong You, “A mirror theorem for multi-root stacks and applications”, arXiv:2006.08991 (2022).

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