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Entropy of an autoequivalence on Calabi-Yau manifolds

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arxiv 1704.06957 v2 pith:7OW5N2WR submitted 2017-04-23 math.AG math.DS

classification math.AGmath.DS
keywords entropymathcalautoequivalencecalabi-yaucategoricallambdacircconjecture
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abstract

We prove that the categorical entropy of the autoequivalence $T_{\mathcal{O}}\circ(-\otimes\mathcal{O}(-1))$ on a Calabi-Yau manifold is the unique positive real number $\lambda$ satisfying $$ \sum_{k\geq 1}\frac{\chi(\mathcal{O}(k))}{e^{k\lambda}}=e^{(d-1)t}. $$ We then use this result to construct the first counterexamples of a conjecture on categorical entropy by Kikuta and Takahashi.

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  1. Primitive invariants from laminations

    math.GT 2025-07 reject novelty 3.0 of 10

    The paper proposes a lamination-based reformulation of Gromov-Witten invariants for complete intersections, but the main theorems are asserted without valid derivations.

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