This is a simple article about the string theory and the many dimensions present in our universe. I wrote this a year ago and is kept as simple as possible to give you a neat idea about the string theory and all the dimensions associated with it.
Here it is :-

The Best String Theory



Introduction: The string theory, which is poised to be the Grand Unified Theory, has run into trouble due to the increasing number of them, satisfying all the mathematical conditions needed to explain the universe. But only one of them can be correct. This paper will try to pin-point the correct string theory.


Let us go back in time to the point of birth of our universe. It was not like the universe we live in .It was a multi-dimensional universe. This then broke up to give the universe we live in now.

String theories predict different dimensions for this multi-dimensional yet-to-be-born Universe .They predict 10 or, 11 or, 26 Dimensions. All these satisfy the mathematical conditions but physically only one of them exists.

The world we are living is 4-Dimensioanal as proposed by Einstein. Another easy of confirming this is that we are able to see 3-D, 2-D and 1-D objects from this universe .We can see a 3-D object only if we are in the 4th Dimension or any other higher dimension.

Suppose the universe began as a 10-Dimensional world then and only then could it break up into the world we live in that is a 4-D,a 3-D,a 2-D and a 1-D world .when we add all these dimensions we get back the 10 Dimensions from where the world started ![1+2+3+4 = 10].None of the other String theories can do this .If they can satisfy this simple analogy then they cannot be proper string theories as it would jeopardize all mathematical identities and make them useless. Hence this String Theory i.e. the 10-D theory is the only valid string theory to explain the universe we live in.