Cosmological String Backgrounds from Gauged WZW Models

Details Cosmological String Backgrounds from Gauged WZW Models Cosmological String Backgrounds from Gauged WZW Models

1992-05-15

arxiv.org/abs/hep-th/9205046v2

Phys.Lett.B289:56-60,1992

Physics

High Energy Physics

High Energy Physics - Theory

11 pages

Scientific paper

10.1016/0370-2693(92)91361-C

We discuss the four-dimensional target-space interpretation of bosonic strings based on gauged WZW models, in particular of those based on the non-compact coset space $SL(2,{\bf R})\times SO(1,1)^2 /SO(1,1)$. We show that these theories lead, apart from the recently broadly discussed black-hole type of backgrounds, to cosmological string backgrounds, such as an expanding Universe. Which of the two cases is realized depends on the sign of the level of the corresponding Kac-Moody algebra. We discuss various aspects of these new cosmological string backgrounds.

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