The rational cohomology characterization of complex tori

Let XX be a compact Kähler manifold of complex dimension nn, and write H(X,Q)H^*(X,\mathbb{Q}) for its rational cohomology algebra. The rational cohomology conjecture for complex tori. Then XX is a complex torus if and only if

H(X,Q)H1(X,Q).H^*(X,\mathbb{Q})\cong \bigwedge^* H^1(X,\mathbb{Q}).

Equivalently,

H(X,C)H1(X,C).H^*(X,\mathbb{C})\cong \bigwedge^* H^1(X,\mathbb{C}).

The preceding theorem establishes the analogous characterization using integral cohomology; the proposed strengthening replaces integral coefficients by rational, or equivalently complex, coefficients, and no resolution is supplied in the source.

Sources & referencesView supporting material

Primary source

Fabrizio Catanese, “Topological methods in moduli theory”, arXiv:1411.3235 (2015).

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