Rank-three semiorthogonal decomposition conjecture for moduli spaces of vector bundles

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Let CC be a smooth projective curve of genus g≥2g\geq 2, let LL be a line bundle of degree 11 on CC, and let M(3,L)M(3,L) be the moduli space of rank-three stable vector bundles on CC with determinant LL. Write CkC_k for the kk-th symmetric power of CC, and let D(X)D(X) denote the bounded derived category of coherent sheaves on XX. Rank-three semiorthogonal decomposition conjecture. The derived category of M(3,L)M(3,L) should have a semiorthogonal decomposition

D(M(3,L))=⟨⋯ ,D(Ck1×Ck2),D(Ck1×Ck2),⋯ ,D(Cg−1×Cg−1)⟩,D(M(3,L))=\langle \cdots,D(C_{k_1}\times C_{k_2}),D(C_{k_1}\times C_{k_2}),\cdots,D(C_{g-1}\times C_{g-1})\rangle,

where (k1,k2)(k_1,k_2) is a pair of nonnegative integers satisfying k1+k2<2(g−1)k_1+k_2<2(g-1) or k1+k2=2(g−1)k_1+k_2=2(g-1) and k1<g−1k_1<g-1. The same source conjectures analogous decompositions for the corresponding Chow and Voevodsky motives and for the Karoubian-completed Fukaya category. These proposed decompositions are intended to make derived, motivic, and Fukaya-category structures reflect one another; the source gives no evidence of resolution.

References

Primary source

Tomás L. Gómez and Kyoung-Seog Lee, “Motivic decompositions of moduli spaces of vector bundles on curves”, arXiv:2007.06067 (2020).

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