How many dementions are there on earth?

Answer 1

No one really knows the answer to this question. With the string theory it was believed there was 10 dimension. Four of them being quite obvious to us (the fourth being space-time) and six of them being curled up into a tiny manifold that we could not see. In the 90's there was a "Second Superstring Revolution," featuring ideas about D-branes, duality, and the unification of what used to be thought of as five distinct versions of string theory. One of the most important ideas in the second revolution came from Ed Witten. Ordinarily, we like to examine field theories and string theories at weak coupling, where perturbation theory works well (QED, for example, is well-described by perturbation theory because the fine-structure constant α = 1/137 is a small number). Witten figured out that when you take the strong-coupling limit of certain ten-dimensional string theories, new degrees of freedom begin to show up (or more accurately, begin to become light, in the sense of having a low mass). Some of these degrees of freedom form a series of states with increasing masses. This is precisely what happens when you have an extra dimension: modes of ordinary fields that wrap around the extra dimension will have a tower of increasing masses, known as Kaluza-Klein modes. In other words: the strong-coupling limit of certain ten-dimensional string theories is an eleven-dimensional theory! In fact, at low energies, it's eleven-dimensional supergravity, which had been studied for years, but whose connection to string theory had been kind of murky. Now we know that 11-d supergravity and the five ten-dimensional string theories are just six different low-energy weakly-coupled limits of some single big theory, which we call M-Theory even though we don't know what it really is. (Even though the 11-d theory can arise as the strong-coupling limit of a 10-d string theory, it is itself weakly coupled in its own right; this is an example of strong-weak coupling duality.) So … how many dimensions are there really? If one limit of the theory is 11-dimensional, and others are 10-dimensional, which is right? I personally believe there are eleven, it just seems to work that way with the M-Theory.

Answer 2

There exist three dimensions in the universe while restraining our discussion only with the motion.

They are along three mutually perpendicular lines. For a while you can look at the bottom corner of your room. You can see that corner being formed by three planes of wall; one in front of you, second in the right of you and the last one is the bottom one. You also can see three edges forming three lines and those are the three mutually perpendicular direction

The above theory applies for you room as well as the universe.

Answer 3

In string theory, it was postulated that ten, maybe eleven, dimensions existed. In probability theory, combined with string theory, it has been postulated that an infinite number of dimensions may exist, even if we cannot conceive of them (with our limited cortical powers!).

Answer 4

i think 11 or at least that's how many in the string theory

Answer 5

At least 3 dimensions, perhaps more. We just don't know for sure.