Topological Strings
نویسنده
چکیده
Following some recent works of Witten, we explore topological non-linear sigma models (TSM). W e construct 2-D topological gravity which is then coupled to the TSM resulting in a topological bosonic string theory. This theory has a nontachyonic vacuum and can be formulated on any even dimensional target manifold which admits some non-trivial topology. It is then shown that the metric independence of the target manifold can not be maintained at the quantum level. Quantum consistency at the one loop level of the sigma model requires that the Ricci scalar vanishes.
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تاریخ انتشار 1988