Transition to light-like trajectories in thin shell dynamics

Robert B. Mann, Ian Nagle, Daniel R. Terno*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)
    18 Downloads (Pure)


    It was recently shown that a massive thin shell that is sandwiched between a flat interior and an exterior geometry given by the outgoing Vaidya metric becomes null in a finite proper time. We investigate this transition for a general spherically-symmetric metric outside the shell and find that it occurs generically. Once the shell is null its persistence on a null trajectory can be ensured by several mechanisms that we describe. Using the outgoing Vaidya metric as an example we show that if a dust shell acquires surface pressure on its transition to a null trajectory it can evade the Schwarzschild radius through its collapse. Alternatively, the pressureless collapse may continue if the exterior geometry acquires a more general form.

    Original languageEnglish
    Pages (from-to)19-35
    Number of pages17
    JournalNuclear Physics B
    Publication statusPublished - 1 Nov 2018

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