Serre-invariant locus conjecture for triangulated categories

Let T\mathcal T be a triangulated category with XFMTX \in \operatorname{FM} \mathcal T. The Fourier–Mukai locus SpecFMT\operatorname{Spec}^{\mathsf{FM}} \mathcal T and the Serre-invariant locus SpecSerT\operatorname{Spec}^{\mathsf{Ser}} \mathcal T are the corresponding loci in the triangular spectrum. Serre-invariant locus conjecture.

SpecFMT=SpecSerT.\operatorname{Spec}^{\mathsf{FM}} \mathcal T=\operatorname{Spec}^{\mathsf{Ser}} \mathcal T.

In particular,

dimSpecSerT=dimSpecFMT=dimX.\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.

Sources & referencesView supporting material

Primary source

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

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