The Gromov–Yomdin type conjecture for categorical entropy

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Let XX be a smooth projective variety over \a0C\a0\mathbb{C}, and let \a0Φ∈Aut⁡(Db(X))\a0\Phi \in \operatorname{Aut}(D^b(X)) be an autoequivalence. Write [Φ]:Knum(X)→Knum(X)[\Phi]: K_{\mathrm{num}}(X) \to K_{\mathrm{num}}(X) for the induced linear map on the numerical Grothendieck group of XX, and let ρ([Φ])\rho([\Phi]) denote its spectral radius. Gromov–Yomdin type conjecture. One has

hcat(Φ)=log⁡ρ([Φ]).h_{\mathrm{cat}}(\Phi)=\log\rho([\Phi]).

This proposes a categorical analogue of the Gromov–Yomdin formula, extending the previously stated equality for pullbacks by surjective endomorphisms. The source provides no resolution of the conjecture.

References

Primary source

Genki Ouchi, “On entropy of spherical twists”, arXiv:1705.01001 (2017).

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