Regular Vaidya solutions exist in effective gravitational theories that dynamically describe radiation-driven formation of regular black holes or mimickers without curvature singularities.
A Note on trapped Surfaces in the Vaidya Solution
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abstract
The Vaidya solution describes the gravitational collapse of a finite shell of incoherent radiation falling into flat spacetime and giving rise to a Schwarzschild black hole. There has been a question whether closed trapped surfaces can extend into the flat region (whereas closed outer trapped surfaces certainly can). For the special case of self-similar collapse we show that the answer is yes, if and only if the mass function rises fast enough.
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UNVERDICTED 2representative citing papers
Tests in symmetrically collapsing spacetimes and the full sub-extreme Kerr-Newman family support the conjecture that compact trapped submanifolds of codimension >1 stay inside black holes and do not reach the domain of outer communications.
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Convex foliations and trapped submanifolds
Tests in symmetrically collapsing spacetimes and the full sub-extreme Kerr-Newman family support the conjecture that compact trapped submanifolds of codimension >1 stay inside black holes and do not reach the domain of outer communications.