Abstract
In this paper we construct a family of new (topologically distinct) solutions to the Einstein constraint equations by performing the generalized connected sum (or fiber sum) of two known compact m-dimensional constant mean curvature solutions (M 1, g 1, Π1) and (M 2, g 2,Π2) along a common isometrically embedded k-dimensional sub-manifold (K, g K ). Away from the gluing locus the metric and the second fundamental form of the new solutions can be chosen as close as desired to the ones of the original solutions. The proof is essentially based on the conformal method and the geometric construction produces a polyneck between M 1 and M 2 whose metric is modeled fiber-wise (i. e. along the slices of the normal fiber bundle of K) around a Schwarzschild metric; for these reasons the codimension n : = m − k of K in M 1 and M 2 is required to be ≥ 3. In this sense our result is a generalization of the Isenberg–Mazzeo–Pollack gluing, which works for connected sum at points and in dimension 3. The solutions we obtain for the Einstein constraint equations can be used to produce new short time vacuum solutions of the Einstein system on a Lorentzian (m + 1)-dimensional manifold, as guaranteed by a well known result of Choquet-Bruhat.
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Acknowledgments
The author would like to thank J. Isenberg, R. Mazzeo and D. Pollack for many helpful suggestions and discussions during the preparation of this paper.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Mazzieri, L. Generalized gluing for Einstein constraint equations. Calc. Var. 34, 453–473 (2009). https://doi.org/10.1007/s00526-008-0191-4
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DOI: https://doi.org/10.1007/s00526-008-0191-4