Comparison of recent SnIa datasets
| dc.contributor.author | Sanchez, J. C. B. | 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/123456789/16480 | |
| dc.rights | Default Licence | - |
| dc.subject | supernova type ia - standard candles | en |
| dc.subject | dark energy experiments | en |
| dc.subject | dark energy theory | en |
| dc.subject | hubble-space-telescope | en |
| dc.subject | high-redshift supernovae | en |
| dc.subject | baryon acoustic peak | en |
| dc.subject | digital sky survey | en |
| dc.subject | bvri light curves | en |
| dc.subject | dark energy | en |
| dc.subject | ia supernovae | en |
| dc.subject | cosmological constant | en |
| dc.subject | accelerating universe | en |
| dc.subject | constraints | en |
| dc.title | Comparison of recent SnIa datasets | en |
| heal.abstract | We rank the six latest Type Ia supernova (SnIa) datasets (Constitution (C), Union (U), ESSENCE (Davis) (E), Gold06 (G), SNLS 1yr (S) and SDSS-II (D)) in the context of the Chevalier-Polarski-Linder (CPL) parametrization w(a)=w(0)+w(1)(1-a), according to their Figure of Merit (FoM), their consistency with the cosmological constant (Lambda CDM), their consistency with standard rulers (Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAO)) and their mutual consistency. We find a significant improvement of the FoM (defined as the inverse area of the 95.4% parameter contour) with the number of SnIa of these datasets ((C) highest FoM, (U), (G), (D), (E), (S) lowest FoM). Standard rulers (CMB+BAO) have a better FoM by about a factor of 3, compared to the highest FoM SnIa dataset (C).We also find that the ranking sequence based on consistency with Lambda CDM is identical with the corresponding ranking based on consistency with standard rulers ((S) most consistent, (D), (C), (E), (U), (G) least consistent). The ranking sequence of the datasets however changes when we consider the consistency with an expansion history corresponding to evolving dark energy (w(0),w(1))=(-1.4,2) crossing the phantom divide line w=-1 (it is practically reversed to (G), (U), (E), (S), (D), (C)). The SALT2 and MLCS2k2 fitters are also compared and some peculiar features of the SDSS-II dataset when standardized with the MLCS2k2 fitter are pointed out. Finally, we construct a statistic to estimate the internal consistency of a collection of SnIa datasets. We find that even though there is good consistency among most samples taken from the above datasets, this consistency decreases significantly when the Gold06 (G) data set is included in the sample. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1088/1475-7516/2009/11/029 | - |
| heal.identifier.secondary | <Go to ISI>://000272271900029 | - |
| heal.identifier.secondary | http://iopscience.iop.org/1475-7516/2009/11/029/pdf/1475-7516_2009_11_029.pdf | - |
| heal.journalName | Journal of Cosmology and Astroparticle Physics | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2009 | - |
| 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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