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Time and space dependent backgrounds from nonsupersymmetric strings

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arxiv hep-th/0209176 v2 pith:PMINDJ4S submitted 2002-09-20 hep-th

Time and space dependent backgrounds from nonsupersymmetric strings

E. Dudas , J. Mourad , C. Timirgaziu This is my paper
classification hep-th
keywords spacebackgroundsdependentfindnonsupersymmetricstringtimebackground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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