the original version of string theory, developed in the late 1960s and named after Satyendra Nath Bose.

a formalism in string theory in which the dynamics of relativistic strings is reformulated in the language of quantum field theory.

In string theory, the string theory landscape (or landscape of vacua) is the collection of possible false vacua,The number of metastable vacua is not known exactly, but commonly quoted estimates are of the order 10500.

The history of string theory spans several decades of intense research including two superstring revolutions.

In theoretical physics, topological string theory is a version of string theory.

In theoretical physics, little string theory is a non-gravitational non-local theory in six spacetime dimensions that can be obtained as an effective theory of NS5-branes in the limit in which gravity decouples.