JournalsjemsVol. 12, No. 3pp. 555–610

Link concordance, homology cobordism, and Hirzebruch-type defects from iterated <em>p</em>-covers

  • Jae Choon Cha

    Pohang University of Science and Technology, South Korea
Link concordance, homology cobordism, and Hirzebruch-type defects from iterated <em>p</em>-covers cover
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Abstract

We obtain new invariants of topological link concordance and homology cobordism of 3-manifolds from Hirzebruch-type intersection form defects of towers of iterated p-covers. Our invariants can extract geometric information from an arbitrary depth of the derived series of the fundamental group, and can detect torsion which is invisible via signature invariants. Applications illustrating these features include the following: (1) There are infinitely many homology equivalent rational 3-spheres which are indistinguishable via multisignatures, η-invariants, and L2-signatures but have distinct homology cobordism types. (2) There is an infinite family of 2-torsion (amphichiral) knots with non-slice iterated Bing doubles; as a special case, we give the first proof of the conjecture that the Bing double of the figure eight knot is not slice. (3) There exist infinitely many torsion elements at any depth of the Cochran–Orr–Teichner filtration of link concordance.

Cite this article

Jae Choon Cha, Link concordance, homology cobordism, and Hirzebruch-type defects from iterated <em>p</em>-covers. J. Eur. Math. Soc. 12 (2010), no. 3, pp. 555–610

DOI 10.4171/JEMS/209