SPACE–TIME SINGULARITIES IN STRING AND ITS LOW DIMENSIONAL EFFECTIVE THEORY
Abstract
Space–time singularities are studied in both the (D+d)-dimensional string theory and its D-dimensional effective theory, obtained by the Kaluza–Klein compactification. It is found that space–time singularities in the low dimensional effective theory may or may not remain after lifted to the (D+d)-dimensional string theory, depending on particular solutions. It is also found that there exist cases in which space–time singularities appearing in high/low dimensional space–times do not necessarily happen on the same surfaces.
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