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math.GT2018
Topology change and selection rules for high-dimensional $\Spin(1, n)_0$-Lorentzian cobordisms
Gleb Smirnov, Rafael Torres
We study necessary and sufficient conditions for the existence of Lorentzian and weak Lorentzian cobordisms between closed smooth manifolds of arbitrary dimension such that the str…
math.GT2009
Irreducible 4-manifolds with abelian non-cyclic fundamental group of small rank
Rafael Torres
A myriad of irreducible symplectic 4-manifolds with abelian non-cyclic fundamental group is constructed. The botany of manifolds with finite non-cyclic fundamental groups is also s…