TL;DR
This paper explores time-dependent bubble spacetimes derived from double analytic continuation of NUT-charged solutions in general relativity, revealing new explicit solutions and the effects of NUT charge on bubble evolution.
Contribution
It introduces new explicit time-dependent solutions from double analytic continuation of NUT-charged spacetimes, including Milne-like and NUT-AdS soliton generalizations.
Findings
NUT charge can induce ergoregions in bubble spacetimes.
NUT charge modifies bubble evolution, especially with rotation.
No consistent single-timelike bubble solutions in higher dimensions.
Abstract
We investigate the various time-dependent bubble spacetimes that can be obtained from double analytic continuation of asymptotically locally flat/AdS spacetimes with NUT charge. We find different time-dependent explicit solutions of general relativity from double analytic continuations of Taub-Nut(-AdS) and Kerr-Nut(-AdS) spacetimes. One solution in particular has Milne-like evolution throughout, and another is a NUT-charged generalization of the AdS soliton. These solutions are all four dimensional. In certain situations the NUT charge induces an ergoregion into the bubble spacetime and in other situations it quantitatively modifies the evolution of the bubble, as when rotation is present. In dimensions greater than four, no consistent bubble solutions are found that have only one timelike direction.
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