Introduction to String Theory Noah Baron Theory of

Introduction to String Theory Noah Baron Theory of Relativity Final Project

Basic Elements of String Theory The smallest particles in elementary physics are modeled as one-dimensional objects called strings. There are two forms of strings: Open strings, which have two endpoints, and closed strings, which form a complete loop, hence the name “closed”. (Some models only use closed strings) Unlike general relativity, string theory allows for higher dimensions, up to 11 dimensions. Uses branes, which are point particle generalizations for higher dimensions (String=dimension 1 brane) String theory is the most eminent unified field theory of physics, attempting to unify the four forces of physics (electromagnetism, gravity, weak force, and strong force)

History of String Theory S-Matrix theory vaguely resembled modern string theory, but had many flaws (1943 -1958) Superstring theory (1974 -1984) First superstring revolution (1984 -1989) Second superstring revolution (1994 -2000)

Criticisms of String Theory Very high energies are necessary to test quantum gravity No real evidence of String Theory; still no real tests Unlike other theories, string theory has no uniqueness, as there a large number of solutions

String Theory- Review Pros: Unified Field Theory Has Mathematical Basis Cons: No empirical evidence Still developing String theory, while exciting, has not developed enough to be considered an accurate model.