#### Volume 21, issue 2 (2017)

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Rational cohomology tori

### Appendix: William F Sawin

Geometry & Topology 21 (2017) 1095–1130
##### Abstract

We study normal compact varieties in Fujiki’s class $\mathsc{C}$ whose rational cohomology ring is isomorphic to that of a complex torus. We call them rational cohomology tori. We classify, up to dimension three, those with rational singularities. We then give constraints on the degree of the Albanese morphism and the number of simple factors of the Albanese variety for rational cohomology tori of general type (hence projective) with rational singularities. Their properties are related to the birational geometry of smooth projective varieties of general type, maximal Albanese dimension, and with vanishing holomorphic Euler characteristic. We finish with the construction of series of examples.

In an appendix, we show that there are no smooth rational cohomology tori of general type. The key technical ingredient is a result of Popa and Schnell on $1$–forms on smooth varieties of general type.

##### Keywords
complex tori, compact Kähler manifolds, rational cohomology ring
##### Mathematical Subject Classification 2010
Primary: 32J27, 32Q15, 32Q55
Secondary: 14F45, 14E99