http://arxiv.org/abs/0901.0640(adsbygoogle = window.adsbygoogle || []).push({});

Horizons and the cosmological constant

Krzysztof A. Meissner

6 pages

(Submitted on 6 Jan 2009)

"A new solution of the Einstein equations for the point mass immersed in the de Sitter Universe is presented. The properties of the metric are very different from both the Schwarzschild black hole and the de Sitter Universe: it is everywhere smooth, light can propagate outward through the horizon, there is an antitrapped surface enclosing the point mass and there is necessarily an initial singularity. The solution for any positive cosmological constant is qualitatively different from the Schwarzschild solution and is not its continuous deformation."

SAMPLE QUOTE:

"4. Conclusions

In the paper we have shown that the solution of the Einstein equations (5) for a point mass immersed in the universe with the positive cosmological constant has very special properties: the metric is everywhere smooth, light can propagate outward through the horizon, there is an antitrapped surface enclosing the point mass and there is necessarily an initial singularity. Although with extremely small value of H such an object for all practical purposes looks like a usual black hole the conceptual diﬀerence resulting from the fact thatthere is no horizon for the outward propagation of light can be far-reaching

– ﬁrst, one should rethink a notion of a black hole entropy as proportional to the area of the horizon and second, there seems to beno information losseven classically since the communication of the inside with the outside is extremely weak but nonvanishing.

It is also interesting to note that in the presence of such objects there is necessarily an initial singularity in distinction to the pure de Sitter universe and there is no continuous deformation connecting Λ > 0 solution described in this paper and the Schwarzschild metric."

What interests me here is how this deSitter black hole solution will serve as a basis for LQG research. We know of Chris Meissner already from his LQG papers:

arXiv:gr-qc/0509049

Eigenvalues of the volume operator in loop quantum gravity

Krzysztof A. Meissner

12 pages, Class.Quant.Grav. 23 (2006) 617-626

arXiv:gr-qc/0407052

Black hole entropy in Loop Quantum Gravity

Krzysztof A. Meissner

10 pages, Class.Quant.Grav. 21 (2004) 5245-5252

And there is already a considerable number of papers using LQG to resolve the black hole singularity---typically finding a bounce. Now I'm wondering what will happen when the same researchers go after this new solution, a black hole in a universe with positive cosmological constant.

One could argue that this solution of Meissner's has added realism at least in the sense that the universe does seem to have a positive cosmological constant. In that case, according to Meissner, there is no horizon. Light carrying information can gradually escape from the interior. This is not the same as the thermal Hawking radiation originating just outside the horizon.

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# New blackhole solution to Einstein eqn, no info paradox (Krzysztof Meissner)

Loading...

Similar Threads for blackhole solution Einstein | Date |
---|---|

I Do these equations have a non-trivial solution? | Sep 15, 2017 |

Graviton, Blackhole and FTL. | Apr 7, 2014 |

String Theory: Higgs and Blackholes | Sep 17, 2008 |

Micro Blackholes | May 10, 2008 |

New view of blackhole bounce | Sep 14, 2007 |

**Physics Forums - The Fusion of Science and Community**