Smoothly knotted and topologically unknotted nullhomologous surfaces in 4-manifolds

Abstract

We point out that recent constructions of inequivalent smooth structures yield a manufacturing procedure of infinite sets of pairwise smoothly non-isotopic nullhomologous 2-tori and spheres inside a myriad of 4-manifolds. The corresponding infinite set consists of topologically isotopic surfaces that topologically bound a handlebody in several instances.

Suggestions from a referee are incorporated in v2. Changes include: added Thm B and a discussion of an invariant of Fintushen-Stern to discern the knotted 2-tori, modified proof of Lemma 1, and a new title. v3: To appear Annales de l'Institut Fourier

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