One of my friends gave a theory about the formation of black holes. He said that:
Black holes are formed when an extremely massive star collapses in its own gravity to produce a particle of infinite (or undefined) density. To contain itself within space and time, it starts releasing antimatter. This antimatter collides with the surrounding matter and destroys it to produce energy, some of which re-enters the black hole. This ensures that a black hole is never destroyed. Similarly, a white hole is produced when an extremely large amount of antimatter collapses and forms an infinitely dense particle that releases matter.
This sounded pretty weird, but I'm not a physicist or anything; so I didn't refute it. Then he went on to state the following:
The Big Bang Theory actually is the releasing of matter by a white hole. Since it was white, only matter was produced and space and time of the universe were allowed to expand. Eventually, far into the future, the universe will start losing energy and gaining matter, thereby becoming inactive. When enough mass exists, the entire universe and the space with it will start collapsing and shrinking. This will also slow down time. This will happen till a single black hole is formed, which in turn will produce an antimatter universe. The same would happen again; our universe has gone through and will go through many such black-hole white-hole cycles.
I don't know, but is there any scientific evidence behind this, or is it just a baseless theory? Can it be completely proven wrong?