Comparison of standard ruler and standard candle constraints on dark energy models
| dc.contributor.author | Lazkoz, R. | en |
| dc.contributor.author | Nesseris, S. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T18:31:31Z | |
| dc.date.available | 2015-11-24T18:31:31Z | |
| dc.identifier.issn | 1475-7516 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16479 | |
| dc.rights | Default Licence | - |
| dc.subject | cmbr theory | en |
| dc.subject | dark energy theory | en |
| dc.subject | supernova type ia | en |
| dc.subject | gamma-ray bursts | en |
| dc.subject | cosmological implications | en |
| dc.subject | supernova data | en |
| dc.subject | universe | en |
| dc.subject | parameter | en |
| dc.subject | distance | en |
| dc.subject | gravity | en |
| dc.subject | matter | en |
| dc.title | Comparison of standard ruler and standard candle constraints on dark energy models | en |
| heal.abstract | We compare the dark energy model constraints obtained by using recent standard ruler data (baryon acoustic oscillations (BAO) at z = 0.2 and 0.35 and cosmic microwave background (CMB) shift parameters R and la) with the corresponding constraints obtained by using recent type Ia supernovae (SnIa) standard candle data (ESSENCE + SNLS + HST from astro-ph/0701510). We find that, even though both classes of data are consistent with Lambda CDM (CDM: cold dark matter) at the 2 sigma level, there is a systematic difference between the two classes of data. In particular, we find that for practically all values of the parameters (Omega(0m), Omega(b)) in the 2 sigma range of the three-year WMAP data (WMAP3) best fit, Lambda CDM is signi. cantly more consistent with the SnIa data than with the CMB + BAO data. For example for (Omega(0m), Omega(b)) = (0.24, 0.042) corresponding to the best fit values of WMAP3, the dark energy equation of state parameterization w(z) = w(0) + w(1)(z/1 + z) best. t is at a 0.5 sigma distance from Lambda CDM(w(0) = -1, w(1) = 0) using the SnIa data and 1.7 sigma away from Lambda CDM using the CMB + BAO data. There is a similar trend in the earlier data (SNLS versus CMB + BAO at z = 0.35). This trend is such that the standard ruler CMB + BAO data show a mild preference for crossing of the phantom divide line w = -1, while the recent SnIa data favor Lambda CDM. Despite this mild difference in trends, we find no statistically significant evidence for violation of the cosmic distance duality relation. = d(L)(z)/d(A)(z)(1 + z)(2) = 1. For example, using a prior of Omega(0m) = 0.24, we find. = 0.95 +/- 0.025 in the redshift range 0 < z < 2, which is consistent with distance duality at the 2 sigma level. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1088/1475-7516/2008/07/012 | - |
| heal.identifier.secondary | <Go to ISI>://000258022800012 | - |
| heal.identifier.secondary | http://iopscience.iop.org/1475-7516/2008/07/012/pdf/1475-7516_2008_07_012.pdf | - |
| heal.journalName | Journal of Cosmology and Astroparticle Physics | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2008 | - |
| 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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