The existence of an aspherical 4-manifold with Euler characteristic one

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Let MM be an oriented closed aspherical 44-manifold, and let χ(M)\chi(M) denote its Euler characteristic.

Aspherical 4-manifold Euler-characteristic problem. There exists an oriented closed aspherical 44-manifold MM with

χ(M)=1.\chi(M)=1.

This is presented as an open problem in 44-dimensional topology and is used to motivate the preceding question about fillings of aspherical 33-manifolds. No example or obstruction is supplied in the source.

References

Primary source

Clara Loeh, Marco Moraschini and George Raptis, “On the simplicial volume and the Euler characteristic of (aspherical) manifolds”, arXiv:2109.08115 (2022).

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