Gravastar

A Gravastern or quasi Blackhole Object ( QBHO ) is a hypothetical celestial object. The origin of the English name " Gravastar " means gravitational vacuum STAR.

According to a theory by Pawel Mazur and Emil Mottola is a very massive star do not develop into a black hole, but would become a Gravastern. For a black hole the star collapses under its own weight, forming a mathematically describable, punctate singularity. On the other hand is assumed in the Gravastern theory that the star collapses only up to a certain limit. In theory, should give rise to quantum effects a kind of phase transition in space-time, thereby further reducing the star is halted.

Mazur and Mottola have suggested that the Gravasterntheorie represents a solution to the information paradox of black holes and could be that Gravasterne sources of gamma-ray bursts. However, many astrophysicists agree that you can also use less speculative theories to explain these phenomena ( see Assumption " Occam's Razor ").

From the outside, a Gravastern appears similar to a black hole - it is only to be discovered by high-energy radiation that is produced by impinging matter. Astronomers scan the sky for radiation signatures to find black holes, could not distinguish between black holes and Gravasternen by the measurements.

Inside the Gravasterns a bubble of dark energy generates the required stability backpressure. The super massive wall of this bubble is the source of gravity of the Gravasterns.

Also, even a whole Gravastern universe was mentioned in this theory. This would in fact also an explanation for dark energy. This universe would, however, contain small eddies in the space-time or rotate.

The Gravastern theory is generally met with little interest, as it is based on a very speculative form of quantum gravity and has no real advantage over the theory of black holes. Furthermore, there is from the perspective of quantum gravity is not a good ground that the space in the way to behave, as Mazur and Mottola accept it.

Also report recent theoretical studies have shown that simultaneous existence of black holes Gravasternen not exclude. Thus Gravasterne would arise as an alternative model no reasonable sense anymore.