Could dark matter actually be ?

Question

the gravity from parallel universes masses crossing through? it's only been shown to be there because there is no other explanation.

Answer 1

You know, that's a very interesting question. One of the biggest mysteries in physics is why gravity is so weak compared to all the other fundamental forces. I know that Lisa Randall, amongst others, have postulated that gravity may exist across dimensions, and therefore its influence is shared between universes. Lisa's work is based on String theory.

There are other competing explanations for dark matter, however, such as WIMPs - weakly interacting massive particles. Nobody is sure what dark matter is, which is part of the fun of science I suppose.

Answer 2

  It was invented to explain why the outer arms of a galaxy can rotate in step with the galactic center without flying apart.

  If a galaxy is not a satellite system then dark matter is not required.

  Another force besides gravity may be driving the evolution of a galaxy,maybe some sort of neutron density matter may at the galactic center may be the force.

Answer 3

Not sure.  I can neither say "no" or "yes" right now because it is not really a testable hypothesis.  I am intrigued, however, deep down, I do feel there is another explaination.  I just have no idea how to come up with one.

:/

Answer 4

Unlikely! Dark matter has been around since the formation of the Universe and the percentage was 63%, 13.7 billion years ago!

Answer 5

"dark matter" could actually be a lot of things, a limitless number of things -- it could also not exist.

Personally, I think it's far more likely that our theory of gravity is flawed than it is likely that mass exists that we don't know of.  Our understanding of gravity doesn't only fail to predict the motion of galaxies, it also fails to model the force of gravity when objects are very very small or very very fast (when quantum theory is used).  Considering the inconsistencies at the quantum scale, and how rock solid quantum theory is, I think it's safe to assume gravitational theory is flawed.

With a new, solid explanation of what we consider gravitational force, there may be absolutely no need for the theoretical "dark matter."  For example, perhaps the gravitational constant isn't actually constant, perhaps it varies with scale or location (or both), or perhaps relativistic equations are completely off-base and there's another model altogether that will replace general relativity (just as general relativity replaced Newtonian gravitation).

The short answer to your question is yes, there may be "parallel universes" and perhaps those dimensions affect our own, but it's pretty unlikely.  Anything is possible.  We're not sure what the answer is yet, although I'm sure we eventually will.

Answer 6

I have very mixed theory on the formation of dark matter. I do not agree with this theory though based on our universe. 99% of the matter in our universe is dark matter. That would mean that this other universe would only have 1% dark matter, and 99% visible matter which would make it a very crowded universe. The simple answer is we don't know. I do think that there are many other explanations for the formation of dark matter.