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Conformal Killing Initial Data
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We find necessary and sufficient conditions ensuring that the vacuum development of an initial data set of the Einstein's field equations admits a conformal Killing vector. We refer to these conditions as conformal Killing initial data (CKID) and they extend the well-known Killing initial data (KID) that have been known for a long time. The procedure used to find the CKID is a classical argument, which is reviewed and presented in a form that may have an independent interest, based on identifying a suitable propagation identity and checking the well-posedness of the corresponding initial value problem. As example applications, we review the derivation of the KID conditions, as well as give a more thorough treatment of the homothetic Killing initial data (HKID) conditions than was previously available in the literature.
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Unit Killing Initial Data
Unit directions of Killing fields in Einstein-Lambda spacetimes are characterized from Cauchy-surface data by a new nonlinear PDE system (uKID), derived two ways and shown to admit at most n(n+1)/2 - 1 independent solutions.
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