New analytic and numerical initial data are constructed for Kaluza-Klein spacetimes with a space-dependent compactification radius, covering black strings, naked or hidden KK bubbles, and multiple black strings.
No naked singularities in homogeneous, spherically symmetric bubble spacetimes?
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abstract
We study the evolution of bubble spacetimes in vacuum and electrovac scenarios by numerical means. We find strong evidence against the formation of naked singularities in (i) scenarios with negative masses displaying initially collapsing conditions and (ii) scenarios with negative masses displaying initially expanding conditions, previously reported to give rise to such singularities. Additionally, we show that the presence of strong gauge fields implies that an initially collapsing bubble bounces back and expands. By fine-tuning the strength of the gauge field we find that the solution approaches a static bubble solution.
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Initial data for a black string and a Kaluza-Klein bubble: Space-dependent compactification radius
New analytic and numerical initial data are constructed for Kaluza-Klein spacetimes with a space-dependent compactification radius, covering black strings, naked or hidden KK bubbles, and multiple black strings.