A new theory claims that the Black Hole might have started Universe. As cosmologists have speculated, the Big Bang theory may be a myth and that the Universe was created by a Black Hole, from a collapsing star. Image © NASA
Top image: The history of the universe starting the with the Big Bang. Image © grandunificationtheory.com
The standard theory is that the universe grew from an infinitely dense point or singularity, but nobody knows what was there before and why this happened?
The new theory helps to explain why the Universe seems to be expanding in all directions.
Zeeya Merali explains the theory suggested by astrophysicist Niayesh Afshordi, at the Perimeter Institute for Theoretical Physics, in Nature:
The standard Big Bang model tells us that the Universe exploded out of an infinitely dense point, or singularity. But nobody knows what would have triggered this outburst: the known laws of physics cannot tell us what happened at that moment. . .
Afshordi and his colleagues [suggest that] our three-dimensional (3D) Universe is a membrane, or brane, that floats through a ‘bulk universe’ that has four spatial dimensions.
Ashfordi’s team realized that if the bulk universe contained its own four-dimensional (4D) stars, some of them could collapse, forming 4D black holes in the same way that massive stars in our Universe do: they explode as supernovae, violently ejecting their outer layers, while their inner layers collapse into a black hole.
In our Universe, a black hole is bounded by a spherical surface called an event horizon. Whereas in ordinary three-dimensional space it takes a two-dimensional object (a surface) to create a boundary inside a black hole, in the bulk universe the event horizon of a 4D black hole would be a 3D object — a shape called a hypersphere. When Afshordi’s team modelled the death of a 4D star, they found that the ejected material would form a 3D brane surrounding that 3D event horizon, and slowly expand.
The authors postulate that the 3D Universe we live in might be just such a brane — and that we detect the brane’s growth as cosmic expansion. “Astronomers measured that expansion and extrapolated back that the Universe must have begun with a Big Bang — but that is just a mirage,” says Afshordi.
Artist’s conception of the event horizon of a black hole. Image © NASA
XDF (Hubble eXtreme Deep Field) image shows fully mature galaxies in the foreground plane – nearly mature galaxies from 5 to 9 billion years ago – protogalaxies, blazing with young stars, beyond 9 billion years.