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A big bang event could explain the reason why the universe expanded in the first place, but it does not explain the accelerating expansion of the universe curre
by smithmayowa 8y ago
A big bang event could explain the reason why the universe expanded in the first place, but it does not explain the accelerating expansion of the universe currently, forgive me for my ignorance if any, but in physics I was taught that any object which moves or is in constant motion was acted upon by a force, and so if the big bang created an expansion it will be a constant expansion and not an accelerating expansion as is obtained presently, as there is a requirement for a kind of force to cause an accelerating expansion which is not explained by a singular big bang but by a continuous big bang, which could as well be infinite in nature.
- gpderetta 8y agoAgain IANAP (and I'm sure any actual physicist will be horrified by my explanation), but the big bang is not an explosion that a time 0 set some mass in motion. But you are, in a way, right: the big bang is not over, is literally still happening right now. General relativity still predict that the process started a finite amount of time ago; wether the process will continue indefinitely or not is still an open question. The expansion is an expected behaviour of space time, and is predicted by general relativity given a certain parametrization of the density of matter an energy of the universe. To explain the acceleration, though, a large energy parameter is required, which has not been yet identified with any known process, although many theories exhist; as placeholder the parameter is known as dark energy. It is of course possible, but generally considered unlikely, that general relativity is incomplete and another theory could explain the acceleration without dark energy.