Abstract
We introduce techniques to study the topology of Stein fillings of a given contact three-manifold \((Y,\xi )\) which are not negative definite. For example, given a \(\hbox {spin}^c\) rational homology sphere \((Y,{\mathfrak {s}})\) with \({\mathfrak {s}}\) self-conjugate such that the reduced monopole Floer homology group \({\textit{HM}}_{\bullet }(Y,{\mathfrak {s}})\) has dimension one, we show that any Stein filling which is not negative definite has \(b_2^+=1\) or 2, and \(b_2^-\) is determined in terms of the Frøyshov invariant. The proof of this uses \(\text {Pin}(2)\)-monopole Floer homology. More generally, we prove that analogous statements hold under certain assumptions on the contact invariant of \(\xi \) and its interaction with \(\text {Pin}(2)\)-symmetry. We also discuss consequences for finiteness questions about Stein fillings.
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Acknowledgements
The author would like to thank András Stipsicz for sharing his expertise on the subject. This work was partially funded by NSF grant DMS-1807242.
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