The universe is expanding, the rate of which seems to be increasing. Why blame it on dark energy?

Question

If dark energy is having a repulsion effect, why is that the theory when an external (outside our universe) pull of gravity could also explain things? Maybe we are contained in something, or maybe there is billions of dense 'universe balls' out there and we are pulled towards them
Out universe was once in a dense ball basically

Answer 1

There is no such thing as "outside our universe". Anything which has the ability to be "outside" would, by definition, be inside the universe.



If we are one of multiple universes, they cannot interact through the eleven dimensions of string theory (whichever of those might exist. What I mean is: none of the physical dimensions we know about) - they cannot pull on objects within our universe. If they could, we should be able to see them (electromagnetism and gravity move at equal speeds. If something attracts you, you must be able to see it (We can only see within our universe (we can see the edge of what we can see, and it is within our universe), so we know that gravity is not the cause of our expansion))



"Dark Energy" is merely a placeholder. We don't know what it really is, we just know that the universe acts like there is an extremely small unbound energy for every unit volume of space, which cannot be explained by the effect of quantum energy (it is, due to quantum mechanics, impossible to have something be completely without energy) or cosmic background radiation, or any form of currently known force whatsoever.





What you are doing is assuming more, not less, than those who simply say "dark energy". They know it's not an explanation, it merely describes what it acts like, while leaving it open for better interpretation. What you are doing is wrongly assuming dark energy is a final answer, and then making your own, even more complicated, solution of your own.





To expand on what nyph says: general relativity - the current model of gravitation - allows for a so-called "universal constant" to exist within it, which acts exactly like dark energy: as if there is an energy pushing everything apart in every volume of space. However, the cause of that "universal constant" is completely unknown too. What this means is that gravity does not disallow dark energy - there is no contradiction between dark energy and gravity in the same way there is a contradiction between gravity and the standard model.

Answer 2

The accepted theory of gravitation, the general theory of relativity, allows for a repulsive force as well as the attrctive force we all know. But the mechanism, the mass or energy that is the source of that force, is not specified by the theory. Dark energy is the mechanism thought to be responsible for teh continuing expansion and acceleration observed by astronomers. Dark matter is thoguht to account for the missing mass needed to explain the gravitational binding observed in the universe.

Answer 3

Our current physics does not believe there is an "outside" the universe that could affect it. Most models that involve other universes do not believe that activities in one universe could significantly affect the expansion of the other.



The explanation you propose is far more complicated, and makes many more assumptions, than dark energy. Unless there is some evidence that the more complicated one is correct, go with the simpler one- something inside the universe is pushing it apart. We call this "dark energy".



You can in principle generate as many explanations as you want for anything. Go for the simplest one that works.

Answer 4

the upward push value isn't a velocity. it truly is a velocity in line with unit distance. the upward push happens everywhere at as quickly as. a splash right here, a splash there. And stuff interior the Universe could be carried through the textile of the Universe far flung from one yet another lots faster than gentle. darkish power or no longer. The universe is huge adequate that the upward push value can and does reason bits that are far adequate aside to circulate faster than gentle far flung from one yet another. And, the sting of the seen Universe is, certainly, the place products are shifting far flung from us at in simple terms decrease than the value of sunshine. previous that, we can't see them, understand approximately them, deliver education to them, no longer something. At ideal we could have seen them interior the previous and wager the place they're now.

Answer 5

Lets say hypothetically those dense cosmos balls exist surrounding our universe



Well, they will be attracted together and collapse in, just as our universe will by itself without some unknown forces accelerating it apart.



as long as gravity is working alone, it will always attract everything together no matter how you arrange them

Answer 6

Because this is one thing he can't blame on George Bush!