Smooth conjecture for enumerative integrals on spaces of maps

Fix cycles ciXc_i^X in the source X=PkX=\mathbb{P}^k and cycles ciYc_i^Y in the target Y=PnY=\mathbb{P}^n, for i=1,,li=1,\ldots,l. Let Mapsd(Pk,Pn)\mathrm{Maps}_d(\mathbb{P}^k,\mathbb{P}^n) be the space of degree-dd holomorphic maps, and let

evi ⁣:Mapsd(Pk,Pn)×P1k××PlkPn\mathrm{ev}_i\colon \mathrm{Maps}_d(\mathbb{P}^k,\mathbb{P}^n)\times \mathbb{P}^k_1\times\cdots\times\mathbb{P}^k_l\longrightarrow\mathbb{P}^n

be evaluation at the ii-th source point. Denote by KM(Pk,Pn;{ciX,ciY}d)\mathrm{KM}(\mathbb{P}^k,\mathbb{P}^n;\{c_i^X,c_i^Y\}|d) the enumerative number of maps satisfying the incidence conditions. Smooth conjecture. For any smooth closed-form representatives αiXΩcl(Pk)\alpha_i^X\in\Omega_{cl}(\mathbb{P}^k) and αiYΩcl(Pn)\alpha_i^Y\in\Omega_{cl}(\mathbb{P}^n) of the Poincaré dual cohomology classes of ciXc_i^X and ciYc_i^Y, the two displayed integrals defining NC,SN^{\mathrm{C,S}} and NS,SN^{\mathrm{S,S}} are convergent and equal to KM(Pk,Pn;{ciX,ciY}d)\mathrm{KM}(\mathbb{P}^k,\mathbb{P}^n;\{c_i^X,c_i^Y\}|d). More specifically, if the cycles have complex codimensions niX,niYn_i^X,n_i^Y and homology classes diX,Yd_i^{X,Y} times the respective generators, then the two Fubini–Study-form integrals, multiplied respectively by idiY\prod_i d_i^Y and i(diXdiY)\prod_i(d_i^Xd_i^Y), both exist and equal the same enumerative number. The conjecture proposes that integrals over the space of quasimaps, smooth on the locus of actual maps, provide a numerical method for computing these enumerative invariants; the paper reports convergence experimentally and correctness in the simplest cases, while a general proof is not supplied.

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Primary source

Olga Chekeres, Santosh Kandel, Andrey Losev, Pavel Mnev, Konstantin Wernli and Donald R. Youmans, “On enumerative problems for maps and quasimaps: freckles and scars”, arXiv:2308.06844 (2024).

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