frenchy

2002-Jan-16, 09:32 PM

I wasn't sure if I should put this in General Astronomy or here since it is an idea put forward by mainstream scientists but it is somewhat against the mainstream.

I just attended a talk by Emil Mottola of Los Alamos in which he presented a new static solution to Einstein's equation. In this case black holes are not singularities, there is no event horizon and no hawking radiation is emitted. He argues that such a solution reproduces all the observed (or observable) properties of black holes without the problems associated with their current classical and semi-classical models.

This isn't my field and so I'll just quote the abstract for his talk. Other people more familiar with GR will, I'm sure, answer any questions that may pop up on this. The talk was very nice btw.

The three regions described below are characterized by their equation of state. The inner de Sitter region has a pressure=-density EOS, the transition region has a Pressure=density EOS, and the outer Schwarzschild region has a zero Pressure and density vaccuum EOS.

"The solution is characterized by an interior de Sitter region of gravitational vacuum condensate with an exterior Schwarzschild geometry of arbitrary total mass M. These are separated by a thin shell with a microscopic but finite proper thickness of ultracold matter, replacing both the Schwarzschild and de Sitter classical horizons. The new solution has no singularities, no event horizons, and a globally defined timelike Killing field. Its entropy is maximized under small fluctuations and is given by the standard hydrodynamic entropy of the thin shell, which is of order M, instead of the Bekenstein-Hawking entropy formula (which is of order M^2). Hence unlike black holes, the new solution is thermodynamically stable and has no information paradox.

The formation of such a cold (1 mu K) gravitational condensate stellar remnant very likely would require a violent collapse process with an explosive output of energy. It is interesting to speculate that the formation and excitation of such objects may provide efficient central engines for very high energy sources in the universe."

I just attended a talk by Emil Mottola of Los Alamos in which he presented a new static solution to Einstein's equation. In this case black holes are not singularities, there is no event horizon and no hawking radiation is emitted. He argues that such a solution reproduces all the observed (or observable) properties of black holes without the problems associated with their current classical and semi-classical models.

This isn't my field and so I'll just quote the abstract for his talk. Other people more familiar with GR will, I'm sure, answer any questions that may pop up on this. The talk was very nice btw.

The three regions described below are characterized by their equation of state. The inner de Sitter region has a pressure=-density EOS, the transition region has a Pressure=density EOS, and the outer Schwarzschild region has a zero Pressure and density vaccuum EOS.

"The solution is characterized by an interior de Sitter region of gravitational vacuum condensate with an exterior Schwarzschild geometry of arbitrary total mass M. These are separated by a thin shell with a microscopic but finite proper thickness of ultracold matter, replacing both the Schwarzschild and de Sitter classical horizons. The new solution has no singularities, no event horizons, and a globally defined timelike Killing field. Its entropy is maximized under small fluctuations and is given by the standard hydrodynamic entropy of the thin shell, which is of order M, instead of the Bekenstein-Hawking entropy formula (which is of order M^2). Hence unlike black holes, the new solution is thermodynamically stable and has no information paradox.

The formation of such a cold (1 mu K) gravitational condensate stellar remnant very likely would require a violent collapse process with an explosive output of energy. It is interesting to speculate that the formation and excitation of such objects may provide efficient central engines for very high energy sources in the universe."