Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-12-20
Phys.Rev.D75:084037,2007
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, revtex, 5 eps figures, footnotes and references added
Scientific paper
10.1103/PhysRevD.75.084037
We study multidimensional gravitational models with scalar curvature nonlinearity of the type 1/R and with form-fields (fluxes) as a matter source. It is assumed that the higher dimensional space-time undergoes Freund-Rubin-like spontaneous compactification to a warped product manifold. It is shown that for certain parameter regions the model allows for a freezing stabilization of the internal space near the positive minimum of the effective potential which plays the role of the positive cosmological constant. This cosmological constant provides the observable late-time accelerating expansion of the Universe if parameters of the model is fine tuned. Additionally, the effective potential has the saddle point. It results in domain walls in the Universe. We show that these domain walls do not undergo inflation.
Saidov Tamerlan
Zhuk Alexander
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