Proper Fourier–Mukai locus conjecture for triangulated categories

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

SpecpFMT=SpecSerT.\operatorname{Spec}^{\mathsf{pFM}}\mathcal T=\operatorname{Spec}^{\mathsf{Ser}}\mathcal T.

In particular,

dimSpecSerT=dimSpecpFMT=dimX,\dim\operatorname{Spec}^{\mathsf{Ser}}\mathcal T=\dim\operatorname{Spec}^{\mathsf{pFM}}\mathcal T=\dim X,

including the last equality as part of the conjecture. The source presents this as an a priori weaker conjecture because proper varieties need not be projective in higher dimension; it gives no 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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