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: (i) They have positive minimal volume entropy. (ii) They satisfy a strict version of the Gromov-Hitchin-Thorpe inequality, with a minimal volume entropy term. (iii) They nevertheless admit infinitely many distinct smooth structures for which no compatible Einstein metric exists.
ASJC Scopus subject areas
- 数学 (全般)