Time and space dependent backgrounds from nonsupersymmetric strings

Details Time and space dependent backgrounds from nonsupersymmetric strings Time and space dependent backgrounds from nonsupersymmetric strings

2002-09-20

arxiv.org/abs/hep-th/0209176v2

Nucl.Phys. B660 (2003) 3-24

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, 1 figure, references added

Scientific paper

10.1016/S0550-3213(03)00248-7

We investigate maximally symmetric backgrounds in nonsupersymmetric string vacua with D-branes and O-planes localized in the compact space. We find a class of solutions with a perturbative string coupling constant in all regions of spacetime. Depending on the particular model, we find either a time evolution with a big-bang type singularity or a space dependent background with generically orbifold singularities. We show that the result can be interpreted as a supersymmetric bulk with some symmetries broken by the boundaries. We also discuss an interesting connection to Lorentzian and Euclidian orbifolds.

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