# Fate of gravitational collapse in semiclassical gravity

@article{Barcel2008FateOG, title={Fate of gravitational collapse in semiclassical gravity}, author={Carlos Barcel{\'o} and Stefano Liberati and Sebastiano Sonego and Matt Visser}, journal={Physical Review D}, year={2008}, volume={77}, pages={044032} }

While the outcome of gravitational collapse in classical general relativity is unquestionably a black hole, up to now no full and complete semiclassical description of black hole formation has been thoroughly investigated. Here we revisit the standard scenario for this process. By analyzing how semiclassical collapse proceeds we show that the very formation of a trapping horizon can be seriously questioned for a large set of, possibly realistic, scenarios. We emphasize that in principle the…

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## References

SHOWING 1-10 OF 98 REFERENCES

Optical geometry for gravitational collapse and Hawking radiation

- Physics
- 2000

The notion of optical geometry, introduced more than 20 years ago as a formal tool in quantum field theory on a static background, has recently found several applications to the study of physical…

Black hole explosions?

- PhysicsNature
- 1974

QUANTUM gravitational effects are usually ignored in calculations of the formation and evolution of black holes. The justification for this is that the radius of curvature of space-time outside the…

Origin of Hawking radiation.

- PhysicsPhysical review. D, Particles and fields
- 1987

It seems that the Hawking effect is associated with themore rather than the event horizon, as an extrapolation of some properties of from a neighborhood of the Schwarzschild horizon to that of an apparent horizon forming in a collapse leads to the result that too much energy is radiated away already before the apparent horizon forms.

Breakdown of Predictability in Gravitational Collapse

- Physics
- 1976

The principle of equivalence, which says that gravity couples to the energy-momentum tensor of matter, and the quantum-mechanical requirement that energy should be positive imply that gravity is…

Stability analysis of sonic horizons in Bose-Einstein condensates

- Physics
- 2006

We examine the linear stability of various configurations in Bose-Einstein condensates with steplike sonic horizons. These configurations are chosen in analogy with gravitational systems with a black…

Black hole evaporation without information loss

- Physics
- 1994

An approach to black hole quantization is proposed wherein it is assumed that quantum coherence is preserved. After giving our motivations for such a quantization procedure we formulate the…

Gravitational vacuum condensate stars.

- PhysicsProceedings of the National Academy of Sciences of the United States of America
- 2004

A new final state of gravitational collapse is proposed, which has no singularities, no event horizons, and a global time and is thermodynamically stable and has no information paradox.

TWILIGHT FOR THE ENERGY CONDITIONS

- Physics
- 2002

The tension, if not outright inconsistency, between quantum physics and general relativity is one of the great problems facing physics at the turn of the millennium. Most often, the problems arising…

Stable gravastars—an alternative to black holes?

- Physics
- 2004

The 'gravastar' picture developed by Mazur and Mottola is one of a very small number of serious challenges to our usual conception of a 'black hole'. In the gravastar picture there is effectively a…

Evanescent black holes.

- PhysicsPhysical review. D, Particles and fields
- 1992

A renormalizable theory of quantum gravity coupled to a dilaton and conformal matter in two spacetime dimensions is analyzed and suggests that the collapsing matter radiates away all of its energy before an event horizon has a chance to form, and black holes disappear from the quantum-mechanical spectrum.