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Simpson, Alex Martín Moruno, María Del Prado Visser, Matt 2023-10-18T12:51:21Z 2023-10-18T12:51:21Z 2019 Simpson, A., Martin-Moruno, P., & Visser, M. (2019). Vaidya spacetimes, black-bounces, and traversable wormholes. Classical and Quantum Gravity, 36(14), 145007. 0264-9381 10.1088/1361-6382/ab28a5 10.48550/arXiv.1902.04232 https://hdl.handle.net/20.500.14352/88335 1361-6382 https://doi.org/10.48550/arXiv.1902.04232 We consider a non-static evolving version of the regular ‘black-bounce’/ traversable wormhole geometry recently introduced in Simpson and Visser (2019 J. Cosmol. Astropart. Phys. JCAP02(2019)042). We first re-write the static metric using Eddington–Finkelstein coordinates, and then allow the mass parameter m to depend on the null time coordinate (à la Vaidya). The spacetime metric is ds2=−1− 2m(w) √r2+a2 dw2−(±2dwdr)+r2+a2 dθ2+sin2θdφ2 . Here w={u,v} denotes suitably defined {outgoing,ingoing} null time coordinates; representing {retarded,advanced} time, while, (at least for a=0), we allow r∈(−∞,+∞). This spacetime is still simple enough to be tractable, and neatly interpolates between Vaidya spacetime, a blackbounce, and a traversable wormhole. We show how this metric can be used to describe several physical situations of particular interest, including a growing black-bounce, a wormhole to black-bounce transition, and the opposite blackbounce to wormhole transition. eng open access Vaidya spacetimes, black-bounces, and traversable wormholes journal article