Comparison of standard ruler and standard candle constraints on dark energy models
Φόρτωση...
Ημερομηνία
Συγγραφείς
Lazkoz, R.
Nesseris, S.
Perivolaropoulos, L.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Cosmology and Astroparticle Physics
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
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.
Περιγραφή
Λέξεις-κλειδιά
cmbr theory, dark energy theory, supernova type ia, gamma-ray bursts, cosmological implications, supernova data, universe, parameter, distance, gravity, matter
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000258022800012
http://iopscience.iop.org/1475-7516/2008/07/012/pdf/1475-7516_2008_07_012.pdf
http://iopscience.iop.org/1475-7516/2008/07/012/pdf/1475-7516_2008_07_012.pdf
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών