Torus and rationality conjecture for homotopy path algebras

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Let X\mathcal{X} be a proper Deligne–Mumford stack of dimension nn with a full strong exceptional collection whose endomorphism algebra AA is a homotopy path algebra. Let XAX_A be the associated cellular complex, and let Tn\mathbb{T}^n be the real nn-torus.

Torus and rationality conjecture. There exists a subcomplex Y⊆XAY \subseteq X_A homotopic to Tn\mathbb{T}^n. Furthermore, X\mathcal{X} is rational, with local systems on YY corresponding to points on X\mathcal{X}, and XAX_A is homotopic to a torus if and only if X\mathcal{X} is toric.

This conjecture proposes a topological model for proper Deligne–Mumford stacks admitting such exceptional collections and relates torus topology of XAX_A to toricness. No resolution or partial result for the full assertion is given in the supplied text.

References

Primary source

David Favero and Jesse Huang, “Homotopy Path Algebras”, arXiv:2205.03730 (2024).

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