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Phys. Rev. D 63, 067301 (2001) [4 pages]

Superinflation, quintessence, and nonsingular cosmologies

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E. Gunzig1,2,*, A. Saa1,3,4,†, L. Brenig1,5,‡, V. Faraoni1,6,§, T. M. Rocha Filho7,**, and A. Figueiredo7,††
1RggR, Université Libre de Bruxelles, CP231, 1050 Bruxelles, Belgium
2Instituts Internationaux de Chimie et de Physique Solvay, CP231, 1050 Bruxelles, Belgium
3Departament de Física Fonamental, Universitat de Barcelona, Avenida Diagonal 647, 08028 Barcelona, Spain
4Departamento de Matemática Aplicada, IMECC–UNICAMP, CP6065, 13081-970 Campinas, São Paulo, Brazil
5Service de Physique Statistique, Université Libre de Bruxelles, CP231, 1050 Bruxelles, Belgium
6INFN-Laboratori Nazionali di Frascati, Box 13, 00044 Frascati, Roma, Italy
7Instituto de Física, Universidade de Brasilia, 70.910-900 Brasilia, Distrito Federal, Brazil

Received 13 October 2000; published 20 February 2001

The dynamics of a universe dominated by a self-interacting nonminimally coupled scalar field are considered. The structure of the phase space and complete phase portraits are given. New dynamical behaviors include superinflation (Ḣ>0), avoidance of big bang singularities through classical birth of the universe, and spontaneous entry into and exit from inflation. This model is promising for describing quintessence as a nonminimally coupled scalar field.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.067301
DOI:
10.1103/PhysRevD.63.067301
PACS:
98.80.Cq

*Email address: egunzig@ulb.ac.be

†Email address: asaa@ffn.ub.es

‡Email address: lbrenig@ulb.ac.be

§Email address: vfaraoni@ulb.ac.be

**Email address: marciano@fis.unb.br

††Email address: annibal@fis.unb.br

 
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