Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am getting curious over why string theory, especially M-theory, is the most popular candidate for the theory of everything.

It seems that all candidates of the theory of everything lack substantial experimental supports, so why is string theory so special?

share|cite|improve this question

String theory is currently the only even remotely viable theory of everything.

There are various other approaches to quantum gravity like Loop Quantum Gravity and Causal Dynamical Triangulation (possibly Causal Sets as well), but these are specific to gravity and make no attempt to, for example, include the Standard Model. While these theories attempt to describe gravity, String/M theory is the only approach that describes all four forces in one theory.

share|cite|improve this answer
it is an opinion – igael Jun 13 '15 at 15:00

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.