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Geodesic motion in a Kaluza-Klein bubble spacetime
Phys. Rev. D 39, 3151 – Published 15 May, 1989
DOI: https://doi.org/10.1103/PhysRevD.39.3151
Abstract
The motion of massive and massless test particles in the geometry of the five-dimensional ‘‘Witten bubble’’ spacetime is explored by obtaining the effective radial potential governing this motion. It is found that massive particles are always in bound orbits. Massless particle orbits have a turning point near the bubble wall, but extend to infinity. These results are consistent with the conception of the bubble wall as a perfectly reflecting, expanding sphere whose expansion rate increases with time.
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