black holes??

Question

If black holes are the result of the density of matter, wouldn't that
mean that the big bang theory and black holes are mutually exclusive?

Answer 1

We don't know much about quantum gravity, that is true. From a distance though the quantum effects don't matter and the general relativity gives an answer very close to the reality. Therefore for macroscopic black holes general relativity givesan acceptable answer.
The density required for a black hole is not constant. For larger volumes the density goes down rapidly. From the theoretical models it is possible to have galaxy-sized black holes where inside you have normal stars, just very close together. This is not very likely to have actually happened. A more likely model would have our whole universe be in the inside of a black hole if there is enough dark matter, but
this also seems disproved with the data we have today.

For the formation of black holes in the center of galaxies the problem is purely one of General relativity, and the densities of matter not that high.

Regarding the effects of inflation we cannot say much because there details of quantum gravity do matter a lot, since at its start the universe did have a microscopic size.

Finally remember that microscopic black holes being created in areas of high density have a high likelihood of evaporatingimmediately due to Hawking radiation.

Answer 2

Actually they are not mutually exclusive...they are complementary. The complement of the black hole is the white hole, where matter is excreted rather than ingested. Based on that model, the big bang is simply a white hole.

Some astrophyscists posit that our universe is just the inside of a black hole. And the big bang is just the stuff sucked into the black hole we exist in. Again, not mutually exclusive, but complementary.

If you believe string theory, there may be parallel universes unseen by us because they lie in other dimensions. I like to speculate that the black hole of one universe is the white hole of another universe. That is, the stuff pouring into a black hole is compressed to very small size (Plank's length) and that almost infinite stored energy alters one or more dimensions so that the highly compacted mass-energy breaks out as a big bang in another universe. [See source.]

Answer 3

The viewpoint I join is the presence of a 'gravity horizon' in a black hole: somewhere along the way into the hole, every particle will reach this horizon. The key is, in order to pass through this horizon, the matter must cease to be matter - to become antimatter and begin to move faster than the speed of light (vibrate faster, with a linear velocity of relative zero). Technically, when the matter goes beyond the Horizon, it leaves our universe.
The big bang is literally the Mother of all Black Holes and is figuratively as well. Particles travel faster than light, lots of fun.

Answer 4

No, because a black hole has a high concentration of mass in a small region of space, while the big bang began with a high density, but nearly uniform, distribution of mass throughout all space.