Dynamic thin-shell black-bounce traversable wormholes (original) (raw)
Related papers
Exotic solutions in General Relativity: Traversable wormholes and 'warp drive' spacetimes
2007
The General Theory of Relativity has been an extremely successful theory, with a well established experimental footing, at least for weak gravitational fields. Its predictions range from the existence of black holes, gravitational radiation to the cosmological models, predicting a primordial beginning, namely the big-bang. All these solutions have been obtained by first considering a plausible distribution of matter, and
0 50 70 63 v 1 1 4 Ju l 2 00 5 Stability analysis of dynamic thin shells
2005
We analyze the stability of generic spherically symmetric thin shells to linearized perturbations around static solutions. We include the momentum flux term in the conservation identity, deduced from the “ADM” constraint and the Lanczos equations. Following the Ishak-Lake analysis, we deduce a master equation which dictates the stable equilibrium configurations. Considering the transparency condition, we study the stability of thin shells around black holes, showing that our analysis is in agreement with previous results. Applying the analysis to traversable wormhole geometries, by considering specific choices for the form function, we deduce stability regions, and find that the latter may be significantly increased by considering appropriate choices for the redshift function. PACS numbers: 04.20.Cv, 04.20.Gz, 04.70.Bw † flobo@cosmo.fis.fc.ul.pt ‡ crawford@cosmo.fis.fc.ul.pt Stability analysis of dynamic thin shells 2
qc / 0 50 70 63 v 2 6 O ct 2 00 5 Stability analysis of dynamic thin shells
2005
We analyze the stability of generic spherically symmetric thin shells to linearized perturbations around static solutions. We include the momentum flux term in the conservation identity, deduced from the “ADM” constraint and the Lanczos equations. Following the Ishak-Lake analysis, we deduce a master equation which dictates the stable equilibrium configurations. Considering the transparency condition, we study the stability of thin shells around black holes, showing that our analysis is in agreement with previous results. Applying the analysis to traversable wormhole geometries, by considering specific choices for the form function, we deduce stability regions, and find that the latter may be significantly increased by considering appropriate choices for the redshift function. PACS numbers: 04.20.Cv, 04.20.Gz, 04.70.Bw † flobo@cosmo.fis.fc.ul.pt ‡ crawford@cosmo.fis.fc.ul.pt Stability analysis of dynamic thin shells 2
2020
We develop a number of novel "black-bounce" spacetimes. These are specific regular black holes where the "area radius" always remains non-zero, thereby leading to a "throat" that is either timelike (corresponding to a traversable wormhole), spacelike (corresponding to a "bounce" into a future universe), or null (corresponding to a "one-way wormhole"). We shall first perform a general analysis of the regularity conditions for such a spacetime, and then consider a number of specific examples. The examples are constructed using a mass function similar to that of Fan--Wang, and fall into several particular cases, such as the original Simpson--Visser model, a Bardeen-type model, and other generalizations thereof. We shall analyse the regularity, the energy conditions, and the causal structure of these models. The main results are several new geometries, more complex than before, with two or more horizons, with the possibility of an extrem...