Serre-invariant locus conjecture for triangulated categories

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Let T\mathcal T be a triangulated category with X∈FM⁡TX \in \operatorname{FM} \mathcal T. The Fourier–Mukai locus Spec⁡FMT\operatorname{Spec}^{\mathsf{FM}} \mathcal T and the Serre-invariant locus Spec⁡SerT\operatorname{Spec}^{\mathsf{Ser}} \mathcal T are the corresponding loci in the triangular spectrum. Serre-invariant locus conjecture.

Spec⁡FMT=Spec⁡SerT.\operatorname{Spec}^{\mathsf{FM}} \mathcal T=\operatorname{Spec}^{\mathsf{Ser}} \mathcal T.

In particular,

dim⁡Spec⁡SerT=dim⁡Spec⁡FMT=dim⁡X.\dim \operatorname{Spec}^{\mathsf{Ser}} \mathcal T=\dim \operatorname{Spec}^{\mathsf{FM}} \mathcal T=\dim X.

The conjecture extends equality known for curves and varieties with ample or anti-ample canonical bundle; the source notes an additional quiver example but gives no general resolution.

References

Primary source

Daigo Ito, “Gluing of Fourier-Mukai partners in a triangular spectrum and birational geometry”, arXiv:2309.08147 (2025).

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