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Perhaps the most studied example of non-critical string theory is that with two-dimensional target space. While clearly not of phenomenological interest, string theories in two dimensions serve as important toy models. They allow one to probe interesting concepts which would be computationally intractable in a more realistic scenario.
These models often have fully non-perturbative descriptions in the form of the quantum mechanics of large matrices. Such a description known as the c=1 matrix model captures the dynamics of [[bosonic string theory]] in two dimensions. Of much recent interest are matrix models of the two-dimensional [[Type 0 string theory|Type 0 string theories]]. These "matrix models" are understood as describing the dynamics of [[open string (physics)|open string]]s lying on [[D-branes]] in these theories. Degrees of freedom associated with [[closed string]]s, and [[spacetime]] itself, appear as emergent phenomena, providing an important example of open string [[tachyon condensation]] in string theory.
== References ==
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