Equivariant DT descendent series Frankenstein algebra conjecture

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Let XX be a nonsingular projective toric 3-fold equipped with an action of the 3-dimensional torus T\mathsf{T}. Let HT(∙)=C[s1,s2,s3]H_{\mathsf{T}}(\bullet)=\mathbb{C}[s_1,s_2,s_3], and let Fr\mathfrak{Fr} be the algebra generated by the series

F2k+1(−q)=∑n=0∞(−q)n∑d∣nd2k,k≥1,F_{2k+1}(-q)=\sum_{n=0}^{\infty}(-q)^n\sum_{d\mid n}d^{2k},\qquad k\geq 1,

and their iterated qddqq\frac{d}{dq} derivatives.

Equivariant DT descendent algebra conjecture. For γi∈HT∗(X,C)\gamma_i\in H^*_{\mathsf{T}}(X,\mathbb{C}) and β∈H2(X,Z)\beta\in H_2(X,\mathbb{Z}),

⟨ch⁡k1(γ1)…ch⁡kl(γl)⟩βDT,T∈HT∗(∙)⊗Q(q)⊗Fr.\big\langle \operatorname{ch}_{k_1}(\gamma_1)\dots \operatorname{ch}_{k_l}(\gamma_l)\big\rangle^{\mathsf{DT},\mathsf{T}}_\beta\in H^*_{\mathsf{T}}(\bullet)\otimes\mathbb{Q}(q)\otimes\mathfrak{Fr}.

The conjecture proposes an algebraic description of equivariant DT descendent series based on computer experiments. The source identifies the analytic behavior of these series as a major unresolved question.

References

Primary source

Alexei Oblomkov, Andrei Okounkov and Rahul Pandharipande, “GW/PT descendent correspondence via vertex operators”, arXiv:1806.00714 (2020).

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