Topological quintessence
| dc.contributor.author | Sanchez, J. C. B. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T18:26:53Z | |
| dc.date.available | 2015-11-24T18:26:53Z | |
| dc.identifier.issn | 1550-7998 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/15973 | |
| dc.rights | Default Licence | - |
| dc.subject | cosmological constant | en |
| dc.subject | global monopole | en |
| dc.subject | inflation | en |
| dc.subject | dynamics | en |
| dc.subject | defects | en |
| dc.subject | field | en |
| dc.title | Topological quintessence | en |
| heal.abstract | A global monopole (or other topological defect) formed during a recent phase transition with core size comparable to the present Hubble scale, could induce the observed accelerating expansion of the Universe. In such a model, topological considerations trap the scalar field close to a local maximum of its potential in a cosmologically large region of space. We perform detailed numerical simulations of such an inhomogeneous dark energy system (topological quintessence) minimally coupled to gravity, in a flat background of initially homogeneous matter. We find that when the energy density of the field in the monopole core starts dominating the background density, the spacetime in the core starts to accelerate its expansion in accordance to a Lambda CDM model with an effective inhomogeneous spherical dark energy density parameter Omega(Lambda)(r). The matter density profile is found to respond to the global monopole profile via an anticorrelation (matter underdensity in the monopole core). Away from the monopole core, the spacetime is effectively Einstein-de Sitter (Omega(Lambda)(r(out)) -> 0) while at the center Omega(Lambda)(r similar or equal to 0) is maximum. We fit the numerically obtained expansion rate at the monopole core to the Union2 data and show that the quality of fit is almost identical to that of Lambda CDM. Finally, we discuss potential observational signatures of this class of inhomogeneous dark energy models. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1103/Physrevd.84.123516 | - |
| heal.identifier.secondary | <Go to ISI>://000298653800002 | - |
| heal.identifier.secondary | http://prd.aps.org/abstract/PRD/v84/i12/e123516 | - |
| heal.journalName | Physical Review D | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2011 | - |
| 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 |
Αρχεία
Πρωτότυπος φάκελος/πακέτο
1 - 1 of 1
Φόρτωση...
- Ονομα:
- perivolaropoulos-2011-Topological quintessence.pdf
- Μέγεθος:
- 250.11 KB
- Μορφότυπο:
- Adobe Portable Document Format
Φάκελος/Πακέτο αδειών
1 - 1 of 1
Φόρτωση...
- Ονομα:
- license.txt
- Μέγεθος:
- 1.74 KB
- Μορφότυπο:
- Item-specific license agreed upon to submission
- Περιγραφή: