of course the mathematical link is trivial but I was thinking about the unification between electromagnetism and gravity. I know it is the famous GUT that everybody wait. But I wanted to know if a great expert like you has original informations out of string theory.
If you want to acquire information about string theory, we have a sub forum called "Beyond the standard model" where people are more than happy to answer your questions and put you in the right direction.
However, I encourage you to search for older threads and reading FAQ and sticky threads and the forum rules before proceeding.