what do u know about string theory???

Answer 1

I know enough of string theory to give myself a feeling of hopelessness. The 'differential pathway' can get you very far in physics; classical mechanics, quantum mechanics and general relativity. But when faced with string theory (now M-theory) I fell flat on my face. I had always ignored group theory until I ran into Noether's theorem and found out, suddenly, that group theory was quite critical to understanding the fundamental laws of nature. In string theory I found that I needed to learn about Lie Algebra's (a beautiful theory), topologies of various sorts and knot theory. Knots...how did they make something so simple so horrendously complicated? My advice to everyone is; don't ignore this 'other pathway'. Differential equations will get you very far and give you the feeling that you can understand everything, until string theory hits you and you understand that you don't know anything at all and that there are a lot of people smarter than yourself after all. Yes, string theory is humbling, and it is still incomplete and could be replaced by something else. It is a beautiful theory but is a patchwork. There is something fundamental which is missing. Also, the theory seems impossible to prove. I believe that the true mathematical framework of nature is still unknown.
I started to study mathematics before moving to physics. This makes studying physics much easier. I find myself wanting to give up on physics and study mathematics again for a few years and then pick up physics again later. I would recommend anyone to learn as much mathematics as possible before studying physics. At least, keep it as far ahead as possible. When you have a firm background in mathematics, the physics is easy.

Answer 2

11 dimensional string theory, (and 26 dimensional M theory), has not produced anything.

It is possible that the extra 7 dimensions of space in string theory, (that are not perceived), are mathematical deception that first appeared with 5 dimensional Kaluza-Klein Theory.

String theory is possibly deception derived from adding dimensions of space to the already existing 3 dimensions of space one dimension at a time at 90 degree angles to the previous dimension.

That string theory is possibly invalid is stated at the end of the wikipedia article on string theory.

Answer 3

string theory is a theory that is promising to try and unify all the forces and particles of nature. it is basically that the very essence of everything is composed of a very small vibrating string type energy. these strings can vibrate at any frequency and can transform into any shape. these strings can break and then reheal. strings come in 2 types, open and closed. gravity is the lowest vibratory closed string, while the photon is the lowest type of open string. higher vibrating strings represent different particles. this theory assumes that the universe originally existed in 10 dimensions, but then broke into 2 pieces. one of the pieces is our 4 dimensional universe. the mathmatics are horrendous but it is a promising theory that physists are trying to understand.

Answer 4

That it's not a scientific theory.

If it doesn't make a prediction that can be tested, then it's a belief--not a scientific theory.

Answer 5

Quite a bit.

Answer 6

I won't try to explain it (I think I understand it! lol)
These might help...
http://superstringtheory.com/basics/index.html
http://en.wikipedia.org/wiki/String_theory
http://en.wikipedia.org/wiki/Superstring_theory