文档介绍：arXiv:hep-th/9201056 v1 28 Jan 1992
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1. Introduction
Of the known soluble string theories in D 2, the D = 2 model is in many
≤
ways particularly intriguing. It has a (two dimensional) space-time interpretation
in terms of the interactions of a massless scalar field, somewhat misleadingly called
the “tachyon,” and the space-time physics is realistic enough to include black holes.
In addition to the tachyon, the model also has “discrete states” which appeared
in the matrix model calculations of Gross, Kl