Evolution of dark energy perturbations in scalar-tensor cosmologies
| dc.contributor.author | Sanchez, J. C. B. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T18:28:54Z | |
| dc.date.available | 2015-11-24T18:28:54Z | |
| dc.identifier.issn | 1550-7998 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16201 | |
| dc.rights | Default Licence | - |
| dc.subject | digital sky survey | en |
| dc.subject | accelerating universe | en |
| dc.subject | constraints | en |
| dc.subject | gravity | en |
| dc.subject | constant | en |
| dc.subject | matter | en |
| dc.subject | quintessence | en |
| dc.subject | relativity | en |
| dc.subject | standard | en |
| dc.subject | clusters | en |
| dc.title | Evolution of dark energy perturbations in scalar-tensor cosmologies | en |
| heal.abstract | We solve analytically and numerically the generalized Einstein equations in scalar-tensor cosmologies to obtain the evolution of dark energy and matter linear perturbations. We compare our results with the corresponding results for minimally coupled quintessence perturbations. We find that scalar-tensor dark energy density perturbations are amplified by a factor of about 10(4) compared to minimally coupled quintessence perturbations on scales less than about 1000 h(-1) Mpc (sub-Hubble scales). On these scales dark energy perturbations constitute a fraction of about 10% compared to matter density perturbations. Scalar-tensor dark energy density perturbations are anticorrelated with matter linear perturbations on sub-Hubble scales. This anticorrelation of matter with negative pressure perturbations induces a mild amplification of matter perturbations by about 10% on sub-Hubble scales. The evolution of scalar field perturbations on sub-Hubble scales is scale independent and therefore corresponds to a vanishing effective speed of sound (c(s Phi) = 0). We briefly discuss the observational implications of our results, which may include predictions for galaxy and cluster halo profiles that are modified compared to Lambda CDM. The observed properties of these profiles are known to be in some tension with the predictions of Lambda CDM. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1103/Physrevd.81.103505 | - |
| heal.identifier.secondary | <Go to ISI>://000278146700018 | - |
| heal.identifier.secondary | http://prd.aps.org/abstract/PRD/v81/i10/e103505 | - |
| heal.journalName | Physical Review D | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2010 | - |
| 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-2010-Evolution of dark energy perturbations in scalar-tensor cosmologies.pdf
- Μέγεθος:
- 513.78 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: