From astrophysicist Ethan Siegel at Forbes:
So could our Universe not have originated from a true singularity, but rather as the three-dimensional wrapping of a collapsing, growing four-dimensional black hole? Perimeter Institute and University of Waterloo researchers Niayesh Afshordi, Razieh Pourhasan and Robert Mann proposed this idea back in 2014, and despite their best attempts, scientists have been unable to rule out this scenario. While higher dimensions may be well outside our experience, they could very well be responsible for our cosmic origins.
Does that mean that every time a supermassive star collapses in a type II supernova and creates a central black hole, a new, two-dimensional Universe is created? As crazy as it sounds, the answer appears to be maybe. The event horizon, as far as we understand it, must encode the full suite of information of all the particles that fell into the black hole over its entire history. The black hole’s surface area is exactly the right size to contain all the information necessary, and no more. More.
This latter point sounds a bit much, but we’ll see. If you want to know why a two-dimensional universe probably wouldn’t really work, read a 19th century novel about it, Flatland (free).
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