Parafermions, Brane Distributions and FRW Hierarchies

Details Parafermions, Brane Distributions and FRW Hierarchies Parafermions, Brane Distributions and FRW Hierarchies

2006-12-22

arxiv.org/abs/hep-th/0612243v1

Fortsch.Phys.55:610-614,2007

Physics

High Energy Physics

High Energy Physics - Theory

7 pages

Scientific paper

10.1002/prop.200610383

I review a class of exact string backgrounds, which appear in hierarchies, where the boundary of the target space of an exact sigma model is itself the target space of another exact model. From the worldsheet viewpoint this is due to the existence of (1,1) operators based on parafermions. From the target space side, it is reminiscent of the structure of maximally symmetric Friedmann-Robertson-Walker cosmological solutions, with broken homogeneity though. Cosmological evolution in this framework raises again the question of the nature of time in string theory.

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