# On String Theory, Supersymmetry and prospects of a theory of everything

The fundamental postulate of string theory is that matter is composed of tiny vibrating loops of string, and each vibrational mode of the string corresponds to a different fundamental particle. Now, since there exists infinitely many possible vibrational modes of the string, it follows that there exists infinitely many matter particles (fermions). Since string theory requires supersymmetry to be consistent, it follows that there would exist infinitely many bosons, hence infinitely many forces. Now, would a phenominologically consistent theory of ''everything'' be possible if there exists infinitely many forces ?

• Well, with a finite energy at hand, we can only access/generate a finite number (out of the infinite tower) of massive string modes. Aug 26 '18 at 14:49
• Aug 26 '18 at 15:49
• This question seems to be acting from wrong/ill-defined premises: 1. There is no equivalency between bosons and forces. What is true is that massless, spin-1 bosons are always gauge bosons and hence associated with a force, but not every boson needs to be associated with a force. 2. It is not clear what you mean by a "phenomenologically consistent theory" for infinitely many forces. "Force" means something very different e.g. in classical and quantum mechanics, a "QFT with N forces" is certainly something very different than a classical theory with N forces. Aug 26 '18 at 16:25