Virtual Betti numbers and the symplectic Kodaira dimension of fibered 4-manifolds

R. Inanc Baykur

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arXiv · 1210.6584

Virtual Betti numbers and the symplectic Kodaira dimension of fibered 4-manifolds

R. Inanc Baykur

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Abstract

We prove that if a closed oriented 4-manifold X fibers over a 2- or 3-dimensional manifold, in most cases all of its virtual Betti numbers are infinite. In turn, we show that a closed oriented 4-manifold X which is not a tower of torus bundles and fibering over a 2- or 3-dimensional manifold does not admit a torsion symplectic canonical class, nor is of Kodaira dimension zero.

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R. Inanc Baykur. 2012-10-24. Virtual Betti numbers and the symplectic Kodaira dimension of fibered 4-manifolds. https://arxiv.org/abs/1210.6584

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