The rational cohomology characterization of complex tori

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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.

References

Primary source

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

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