Transition to light-like trajectories in thin shell dynamics

Abstract

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.

arXiv comment6+4 pages, 1 figure. Comments welcome

References in corpus (21)

• A Primer for Black Hole Quantum Physics
• Black hole evaporation: A paradigm
• Black Hole Remnants and the Information Loss Paradox
• A Primer on Energy Conditions
• Fate of gravitational collapse in semiclassical gravity
• Hawking radiation, the Stefan-Boltzmann law, and unitarization
• Regular black holes: Electrically charged solutions, Reissner-Nordström outside a de Sitter core
• Observation of Incipient Black Holes and the Information Loss Problem
• Gravitationally Collapsing Dust in $(2+1)$ Dimensions
• A Self-consistent Model of the Black Hole Evaporation
• Hawking-like radiation does not require a trapped region
• Radiation from a collapsing object is manifestly unitary
• Dark energy, wormholes, and the Big Rip
• Radiation from collapsing shells, semiclassical backreaction and black hole formation
• Role of evaporation in gravitational collapse
• The Absence of Horizon in Black-Hole Formation
• Pre-Hawking radiation cannot prevent the formation of apparent horizon
• Do event horizons exist?
• Light-like Signals in General relativity and Cosmology
• Bootstrapping Time Dilation Decoherence
• Horizon avoidance in spherically-symmetric collapse

Cited by in corpus (10)

• Black hole evaporation and semiclassical thin shell collapse
• Spacetime continuity and quantum information loss
• Giant Tortoise Coordinate
• Self-consistent description of a spherically-symmetric gravitational collapse
• Pandora's box lid: geometry near the apparent horizon
• Kinematic censorship as a constraint on allowed scenarios of high energy particle collisions
• Stability of regular black holes and other compact objects with a charged de Sitter core and a surface matter layer
• Asymptotic States of Black Holes in KMY Model
• Black holes and their horizons in semiclassical and modified theories of gravity
• Apparent horizon as a membrane