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An essential relation between Einstein metrics, volume entropy, and exotic smooth structures

Michael Brunnbauer, Masashi Ishida, Pablo Su\'arez-Serrato
Arxiv ID: 0807.1187Last updated: 2/15/2022
We show that the minimal volume entropy of closed manifolds remains unaffected when nonessential manifolds are added in a connected sum. We combine this result with the stable cohomotopy invariant of Bauer-Furuta in order to present an infinite family of four-manifolds with the following properties: 1) They have positive minimal volume entropy. 2) They satisfy a strict version of the Gromov-Hitchin-Thorpe inequality, with a minimal volume entropy term. 3) They nevertheless admit infinitely many distinct smooth structures for which no compatible Einstein metric exists.

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