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A factorization of spacetime of the form M^3xM^3xM^3 is considered in thispaper as the closed string background in type IIA. The idea behind thisconstruction is that each M^3 might give rise to one large spatial dimension of4-dimensional spacetime in the closed string sector. In the open string sector,intersecting D6-branes can be constructed for the simple choice of anorientifolded M^3=T^3 in a similar way as on the prominent T^6=T^2xT^2xT^2using exact CFT. The D6-branes then are allowed to span general 2-cycles oneach T^3. The intersection 1-cycles between two stacks of branes on one T^3 canbe understood as one spatial dimension of the effective 4-dimensional'spacetime' for the massless chiral fermions charged under these two stacks.Additionally to the known solutions to the R-R tadpole equations conserving(3+1)-dimensional Poincare invariance, this allows for solutions with globallyjust (2+1)- or (1+1)-Poincare invariance. For non-supersymmetric solutions, astring tree-level and one-loop potential for the scalar moduli (including thespacetime radii) is generated in the NS-NS sector. This potential here isinterpreted dynamically for radii and dilaton in order to describe the globalevolution of the universe. In the late time picture, (3+1)-dimensional globalPoincare invariance can be restored well within experimental bounds. Thisapproach links particle properties (the massless chiral fermion spectrum)directly to the global evolution of the universe by the scalar potential, bothdepending on the same topological wrapping numbers. In the future, this mightlead to much better falsifiable phenomenological models.Comment: 53 pages, 6 figures, v2:references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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