Physics NotePublished
Geometrized Instantons and the Creation of the Universe
M. Novello; L. A. R. Oliveira; J. M. Salim; E. Elbaz
1991
Publication details
- Authors
- M. Novello; L. A. R. Oliveira; J. M. Salim; E. Elbaz
- Type
- Physics Note
- Status
- Published
- Publication date
- 1991
- Description
- A non-singular cosmological scenario is presented in which currently observed Riemannian configuration of space-time originates from a primordial Weylian "stiff matter" phase driven by a geometrized inflaton-like field. In the particular case of a Friedman-Robertson-Walker line element, it is shown that an unstable original Minkowski vacuum starts to collapse adiabatically at a remote past and bounces when a minimum radius is attained. Throughout the collapsing stage this matter-free Universe is accelerated (or "inflationary") As in models of spontaneous quantum creation, the bouncing phase can be shown to correspond to the propagation of a Weyl instanton in an Euclideanized, classically forbidden region. In the course of the bouncing period, concurrent to the maximal deviation of the Riemannian configuration, a geometry-driven amplification mechanism operates causing the exponential increase of entropy and matter fluctuations. Once the environment temperature is always bounded, this non-adiabatical process stands for a "Big - but finite - Bang" creation event, followed by a standard radiation-dominated era. The model describes an eternal, Friedman-like open Universe, free of many problems that hinder standard cosmology; the observed existence of a baryon excess also naturally within the proposed scheme.
- Year
- 1991
- Number
- CBPF-NF-049/91
- Linked to a thesis
- No
- Linked to a grant
- No