DeWitt, Bryce ; Graham, R. One proposal for doing so is string theory , which posits that the point-like particles of particle physics are replaced by one-dimensional objects called strings. Article Talk. Go to top. He argued that quantum mechanics was incomplete, a theory that was valid but not fundamental, analogous to how thermodynamics is valid, but the fundamental theory behind it is statistical mechanics. Language Research Foundation, Boston. New York: Springer-Verlag. Retrieved 18 May