Classical and Quantum D-branes in 2D String Theory

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Abstract
We investigate two classes of D-branes in 2-d string theory, corresponding to extended and localized branes, respectively. We compute the string emission during tachyon condensation and reinterpret the results within the c=1 matrix model. As in hep-th/0304224, we find that the extended branes describe classical eigenvalue trajectories, while, as found in hep-th/0305159, the localized branes correspond to the quantum field that creates and destroys eigenvalues. This result suggests that the localized brane acts as the operator that creates the quantum version of the extended brane.

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