Singularity-free cosmological solutions in quadratic gravity
| dc.contributor.author | Kanti, P. | en |
| dc.contributor.author | Rizos, J. | en |
| dc.contributor.author | Tamvakis, K. | en |
| dc.date.accessioned | 2015-11-24T18:35:25Z | |
| dc.date.available | 2015-11-24T18:35:25Z | |
| dc.identifier.issn | 0556-2821 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/17096 | |
| dc.rights | Default Licence | - |
| dc.subject | dilatonic black-holes | en |
| dc.subject | curvature string gravity | en |
| dc.subject | scalar-tensor cosmologies | en |
| dc.subject | graceful exit problem | en |
| dc.subject | big-bang cosmology | en |
| dc.subject | superstring cosmology | en |
| dc.subject | nonsingular universe | en |
| dc.subject | field | en |
| dc.subject | inflation | en |
| dc.subject | duality | en |
| dc.title | Singularity-free cosmological solutions in quadratic gravity | en |
| heal.abstract | We study a general field theory of a scalar held coupled to gravity through a quadratic Gauss-Bonnet term xi(phi)R-GB(2). The coupling function has the form xi(phi) = phi(n), where n is a positive integer, in the absence of the Gauss-Bonnet term, the cosmological solutions for an empty universe and a universe dominated by the energy-momentum tensor of a scalar field are always characterized by the occurrence of a true cosmological singularity. By employing analytical, and numerical methods, we show that, in the presence of the quadratic Gauss-Bonnet term. for the dual case of even n, the set of solutions of the classical equations of motion in a curved FRW background includes singularity-free cosmological solutions. The singular solutions are shown to be confined in a part of the phase space of the theory allowing the nan-singular solutions to fill the rest of the space. We conjecture that the same theory with a general coupling function that satisfies certain criteria may lead to non-singular cosmological solutions. [S0556-2821(99)01804-4]. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://000079755500019 | - |
| heal.journalName | Physical Review D | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 1999 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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