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One-point functions for $C_2$-cofinite VOAs: pseudo-traces and trace spaces of projective modules
[Submitted on 17 Jun 2026] · 2026-06-19 · via math updates on arXiv.org

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Abstract:We study the space of one-point functions on the torus for a possibly nonrational $C_2$-cofinite vertex operator algebra $V$ by relating it to a trace object of the subcategory of projective objects in the representation category of $V$. We identify the dual of the trace space with symmetric functions on the endomorphism algebra $E$ of a projective generator. Motivated by the Gainutdinov-Runkel conjecture, recently established using different methods by Gui and Zhang, we present a complementary representation-theoretic approach based on Arike-Nagatomo pseudo-traces. In this framework, we prove surjectivity of the Gainutdinov-Runkel map from symmetric functions on $E$ to one-point functions. Under the additional assumption of separated conformal weights modulo $\mathbb{Z}$, we also prove injectivity, using projective-cover techniques inspired by Huang.

Submission history

From: Max-Niklas Steffen [view email]
[v1] Wed, 17 Jun 2026 22:01:33 UTC (426 KB)

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