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A new class of spatially homogeneous 4D string backgrounds
A new class of spatially homogeneous 4D string backgrounds, the X(d\rightarrow) according to a recent classification, is presented and shown to contain only five generic types. In contrast to the case of X(d\uparrow) (which contains as a subclass all possible FRW backgrounds), exact SO(3) isotropy i...
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| Lenguaje: | eng |
| Publicado: |
1995
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| Acceso en línea: | https://dx.doi.org/10.1016/0370-2693(95)00632-U http://cds.cern.ch/record/278965 |