We produce a rational homology 3-sphere that does not smoothly bound either a positive or negative definite 4-manifold. Such a 3manifold necessarily cannot be rational homology cobordant to a Seifert fibered space or any 3-manifold obtained by Dehn surgery on a knot. The proof requires an analysis of short characteristic covectors in bimodular lattices.
机构:
Univ Calif Santa Barbara, Microsoft Res, Stn Q, Santa Barbara, CA 93106 USA
Univ Calif Santa Barbara, Dept Math, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Microsoft Res, Stn Q, Santa Barbara, CA 93106 USA
Freedman, Michael
Zuddas, Daniele
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机构:
Univ Bayreuth, Math Inst, Lehrstuhl Math 8, NW 2,Univ Str 30, D-95447 Bayreuth, GermanyUniv Calif Santa Barbara, Microsoft Res, Stn Q, Santa Barbara, CA 93106 USA