Collapse and bounce of null fluids

Abstract

Exact solutions describing the spherical collapse of null fluids can contain regions which violate the energy conditions. Physically the violations occur when the infalling matter continues to move inwards even when non-gravitational repulsive forces become stronger than gravity. In 1991 Ori proposed a resolution for these violations: spacetime surgery should be used to replace the energy condition violating region with an outgoing solution. The matter bounces. We revisit and implement this proposal for the more general Husain null fluids including a careful study of potential discontinuities and associated matter shells between the regions. Along the way we highlight an error in the standard classification of energy condition violations for Type II stress-energy tensors.

13 pages, 4 figures. V2: Error corrected so that the thin shell now vanishes for Ori matching conditions. Other minor changes. V3 (version accepted to PRD): error in Fig 1 fixed, section and appendix added on smoothness of matter fields, numerous references added

References in corpus (5)

• Warp drive basics
• Radiating black hole solutions in arbitrary dimensions
• Charged Vaidya Solution Satisfies Weak Energy Condition
• Gravitational Collapse in Higher Dimensional Husain Space-Time
• Evolutions from extremality

Cited by in corpus (9)

• Surrounded Vaidya Solution by Cosmological Fields
• Massless charged particles: Cosmic censorship, and Third law of Black Hole Mechanics
• Gravitational Collapse in the EGB Gravity
• Marginally Trapped Surfaces in Spherical Gravitational Collapse
• Regular Black Hole Models in the Transition from Baryonic Matter to Quark Matter
• Evaporation of a nonsingular Reissner-Nordström black hole and information loss problem
• Self-similar solutions and critical behavior in Einstein-Maxwell-dilaton theory sourced by charged null fluids
• Spherical trapped surfaces in n-dimensional general relativity
• Homothetic Killing horizons in generic Vaidya spacetimes