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https://olympias.lib.uoi.gr/jspui/handle/123456789/17038Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Basilakos, S. | en |
| dc.contributor.author | Sanchez, J. C. B. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T18:35:05Z | - |
| dc.date.available | 2015-11-24T18:35:05Z | - |
| dc.identifier.issn | 1550-7998 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/17038 | - |
| dc.rights | Default Licence | - |
| dc.subject | generalized chaplygin-gas | en |
| dc.subject | luminous red galaxies | en |
| dc.subject | equation-of-state | en |
| dc.subject | observational constraints | en |
| dc.subject | power spectrum | en |
| dc.subject | constant | en |
| dc.subject | matter | en |
| dc.subject | density | en |
| dc.subject | evolution | en |
| dc.subject | universe | en |
| dc.title | Spherical collapse model and cluster formation beyond the Lambda cosmology: Indications for a clustered dark energy? | en |
| heal.type | journalArticle | - |
| heal.type.en | Journal article | en |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.identifier.primary | Doi 10.1103/Physrevd.80.043530 | - |
| heal.identifier.secondary | <Go to ISI>://000269641400045 | - |
| heal.identifier.secondary | http://prd.aps.org/abstract/PRD/v80/i4/e043530 | - |
| heal.language | en | - |
| heal.access | campus | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.publicationDate | 2009 | - |
| heal.abstract | We generalize the small scale dynamics of the Universe by taking into account models with an equation of state which evolves with time, and provide a complete formulation of the cluster virialization attempting to address the nonlinear regime of structure formation. In the context of the current dark energy models, we find that galaxy clusters appear to form at z similar to 1-2, in agreement with previous studies. Also, we investigate thoroughly the evolution of spherical matter perturbations, as the latter decouple from the background expansion and start to "turn around" and finally collapse. Within this framework, we find that the concentration parameter depends on the choice of the considered dark energy (homogeneous or clustered). In particular, if the distribution of the dark energy is clustered then we produce more concentrated structures with respect to the homogeneous dark energy. Finally, comparing the predicted concentration parameter with the observed concentration parameter, measured for four massive galaxy clusters, we find that the scenario which contains a pure homogeneous dark energy is unable to reproduce the data. The situation becomes somewhat better in the case of an inhomogeneous (clustered) dark energy. | en |
| heal.journalName | Physical Review D | en |
| heal.journalType | peer reviewed | - |
| heal.fullTextAvailability | TRUE | - |
| Appears in Collections: | Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| perivolaropoulos-2009-Spherical collapse model and cluster formation beyond the Lambda cosmology Indications for a clustered dark energy.pdf | 315.92 kB | Adobe PDF | View/Open |
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