While the current Planck outcomes “verify that inflation is correct”, they leave open the question of how actually the inflation took place. A new study could help to show how inflation was caused by the motion of the Universe over a higher-dimensional reality. The event horizon of a black hole — also known as the point of no return for anything that falls in — is a sphere-shaped surface. In a higher-dimensional reality, a black hole might have a three-dimensional event horizon, which could start an entire new universe as it forms. It might be time to bid the Big Bang bye-bye. Cosmologists have guessed that the Universe made from the wreckage expelled when a four-dimensional star collapsed into a black hole — a situation that would help to clarify why the cosmos appears to be so uniform in all the ways. The regular Big Bang model tells us that the Universe blasted out of an infinitely compressed point, or singularity. But not one person knows what would have caused this outbreak: the known laws of physics cannot tell us what took place at that moment.
The authors suggest that the 3D Universe we live in can be just such a membrane or a brane — and that we spot the brane’s growth as cosmic expansion. Afshordi says “Astronomers measured that expansion and extrapolated back that the Universe must have begun with a Big Bang — but that is just a mirage,”
This theory also naturally clarifies our Universe’s uniformity. As the 4D bulk universe could have occurred for an infinitely long time in the past, there possibly would have been plenty of chance for different portions of the 4D bulk to reach an equilibrium, which our 3D Universe would have inherited.