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**Physics Note****Published**

# **Geometrized Instantons and the Creation of the Universe**

**M. Novello; L. A. R. Oliveira; J. M. Salim; E. Elbaz**

1991

[**Download PDF **1.8 MB](https://index.cbpf.br/files/publicacao/6ad2a767639f62b11adbb6a4/pdf) [**Contact owner**](mailto:apub@cbpf.br?subject=Geometrized%20Instantons%20and%20the%20Creation%20of%20the%20Universe)

## **Publication details**

<dl>

<dt>Authors</dt>
<dd>M. Novello; L. A. R. Oliveira; J. M. Salim; E. Elbaz</dd>

<dt>Type</dt>
<dd>Physics Note</dd>

<dt>Status</dt>
<dd>Published</dd>

<dt>Publication date</dt>
<dd>1991</dd>

<dt>Description</dt>
<dd>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.</dd>

<dt>Year</dt>
<dd>1991</dd>

<dt>Number</dt>
<dd>CBPF-NF-049/91</dd>

<dt>Linked to a thesis</dt>
<dd>No</dd>

<dt>Linked to a grant</dt>
<dd>No</dd>

</dl>

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