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math.DG2020
Negative Sasakian structures on simply-connected 5-manifolds
V. Muñoz, M. Schütt, A. Tralle
We study several questions on the existence of negative Sasakian structures on simply connected rational homology spheres and on Smale-Barden manifolds of the form $\#_k(S^2\times…
math.AG2020
12 rational curves on Enriques surfaces
Sławomir Rams, Matthias Schütt
Given d in IN, we prove that any polarized Enriques surface (over any field of characteristic different from 2 or with a smooth K3 cover) of degree greater than 12d^2 contains at m…