Morita invariance conjecture for the connected higher automorphism group

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Let C\mathcal{C} be a graded k\Bbbk-linear category such that

Hom⁡Ci(C,D)=0\operatorname{Hom}^i_{\mathcal{C}}(C,D)=0

for all C,D∈Ob⁡(C)C,D\in\operatorname{Ob}(\mathcal{C}) and all i≥1i\geq 1. Write Aut⁡∘∞(C)\operatorname{Aut}^{\infty}_{\circ}(\mathcal{C}) for the connected component of the identity in the higher automorphism group of C\mathcal{C}. Morita invariance conjecture. The group Aut⁡∘∞(C)\operatorname{Aut}^{\infty}_{\circ}(\mathcal{C}) is a Morita invariant of C\mathcal{C}. This would make precise the analogy with the connected component of the identity in the derived Picard group, assuming a suitable differential graded group-scheme interpretation of the derived Picard group. The source does not state a resolution of the conjecture.

References

Primary source

Sebastian Opper, “Integration of Hochschild cohomology, derived Picard groups and uniqueness of lifts”, arXiv:2405.14448 (2026).

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