1994/08/25 by E. I. Guendelman, A. B. Kaganovich
Physics and Astronomy · #gr-qc
published as Grav.Cosmol. 1 (1995) 103-105 · 5 pages, Latex, BGU-94/17/August-PH
arxiv created 1994/08/25 · arxiv updated 2009/11/30
In many interesting models, including superstring theories, a negative vacuum energy is predicted. Although this effect is usually regarded as undesirable from a cosmological point of view, we show that this can be the basis for a new approach to the cosmology of the early Universe. In the framework of quantum cosmology (in higher dimensions) when we consider a negative cosmological constant and matter that could be dust or, alternatively, coherent excitations of a scalar field, the role of cosmic time can be understood. Then we can predict the existence of a ``quantum inflationary phase'' for some dimensions and a simultaneous ``quantum deflationary phase'' for the remaining dimensions. We discuss how it may be possible to exit from this inflation-compactification era to a phase with zero cosmological constant which allows a classical description at late times.