Non-singular string-cosmologies from exact conformal field theories
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Publication:1602373
DOI10.1016/S0920-5632(01)01557-2zbMATH Open1006.83084arXivhep-th/0110262MaRDI QIDQ1602373
Author name not available (Why is that?)
Publication date: 19 June 2002
Published in: (Search for Journal in Brave)
Abstract: Non-singular two and three dimensional string cosmologies are constructed using the exact conformal field theories corresponding to SO(2,1)/SO(1,1) and SO(2,2)/SO(2,1). {it All} semi-classical curvature singularities are canceled in the exact theories for both of these cosets, but some new quantum curvature singularities emerge. However, considering different patches of the global manifolds, allows the construction of non-singular spacetimes with cosmological interpretation. In both two and three dimensions, we construct non-singular oscillating cosmologies, non-singular expanding and inflationary cosmologies including a de Sitter (exponential) stage with positive scalar curvature as well as non-singular contracting and deflationary cosmologies. Similarities between the two and three dimensional cases suggest a general picture for higher dimensional coset cosmologies: Anisotropy seems to be a generic unavoidable feature, cosmological singularities are generically avoided and it is possible to construct non-singular cosmologies where some spatial dimensions are experiencing inflation while the others experience deflation.
Full work available at URL: https://arxiv.org/abs/hep-th/0110262
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