All Questions

Due to the recent spate of detections of gravitational waves by LIGO, my amateurish interest in the mathematics of general relativity has been revived. The wave-forms of the detected gravitational ...

The following puzzles me already for quite some time: In mathematical relativity, especially in the discussion of the Cauchy problem, one usually works in the so-called ADM-Formalism, in which one ...

The following lemma is from Fisher, Marsden, and Moncrief's paper: the structure of the space of solutions of Einstein's equations:1 1.1. Lemma. If Ein( $\left.{ }^{(4)} g\right)=0$, and ${ }^{(4)} h$ ...