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quote:Originally posted by neilepIs there any eventuality at all that one could imagine where a black hole may lose it's ' black-hole-ness ' and revert to being what ?..a neutron star perhaps ?Could there be a possibility where a body is almost...almost becoming a black hole and fluctuates between the two states ?I think I know the answer that once a black hole...always a black hole ?...but...is there any circumstance one can imagine ?..how ever bizarre it is, but in theory may be a possibility ?...even the remotest one ?
quote:Originally posted by neilepCould there be a possibility where a body is almost...almost becoming a black hole and fluctuates between the two states ?
quote:A misconception about event horizons, especially black hole event horizons, is that they represent an immutable surface that destroys objects that approach them. In practice, several features are common to all event horizons: they appear to be some distance away from any observer, objects sent towards an event horizon never appear to cross it from the sending observer's point of view (as the horizon-crossing event's light cone never intersects the observer's world line).
quote:The Unruh effect, discovered in 1976 by Bill Unruh of the University of British Columbia, is the prediction that an accelerating observer will observe black-body radiation where an inertial observer would observe none. In other words, the accelerating observer will find themselves in a warm background. The quantum state which is seen as ground state for observers in inertial systems is seen as a thermodynamic equilibrium for the uniformly accelerated observer.Unruh demonstrated that the very notion of vacuum depends on the path of the observer through spacetime. From the viewpoint of the accelerating observer, the vacuum of the inertial observer will look like a state containing many particles in thermal equilibrium — a warm gas.The existence of Unruh radiation can be linked to this apparent event horizon, putting it in the same conceptual framework as Hawking radiation. On the other hand, the Unruh effect shows that the definition of what constitutes a "particle" depends on the state of motion of the observer.