期刊
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
卷 63, 期 1, 页码 12-35出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/prop.201400073
关键词
cosmic inflation; anomaly free superstringscosmology
资金
- CEFIPRA/IFCPAR [4104-2]
- PICS France/Cyprus
- Munich Excellence Cluster for Fundamental Physics Origin and the Structure of the Universe
- ERC Advanced Grant Strings and Gravity [32004]
- Gay Lussac-Humboldt Research Award, at the Ludwig Maximilians University
- Max-Planck-Institute for Physics
The R-2 scale invariant gravity theory coupled to conformally invariant matter is investigated. We show that in the non-supersymmetric case the conformally coupled scalars belong to an SO(1, 1 + n)/SO(1 + n) manifold, while in the supersymmetric case the scalar manifold becomes isomorphic to the Kahlerian space M-n = SU(1, 1 + n)/U(1) x SU (1 + n). In both cases when the underlying scale symmetry is preserved the vacuum corresponds to de Sitter space. Once the scale symmetry is broken by quantum effects, a transition to flat space becomes possible. We argue that the scale violating terms are induced by anomalies related to a U(1)(R) symmetry. The anomaly is resolved via the gauging of a Peccei-Quinn axion shift symmetry. The theory describes an inflationary transition from de Sitter to flat Minkowski space, very similar to the Starobinsky inflationary model. The extension to metastable de Sitter superstring vacua is also investigated. The scalar manifold is extended to a much richer manifold, but it contains always M-n as a sub-manifold. In superstrings the metastability is induced by axions that cure the anomalies in chiral N = 1 (or even N = 0) supersymmetric vacua via a Green-Schwarz/Peccei-Quinn mechanism generalized to four dimensions. We present some typical superstring models and discuss the possible stabilization of the no-scale modulus.
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