SIMBAD references

2008ApJ...677....1D - Astrophys. J., 677, 1-11 (2008/April-2)

Improved constraints on the acceleration history of the universe and the properties of the dark energy.

DALY R.A., DJORGOVSKI S.G., FREEMAN K.A., MORY M.P., O'DEA C.P., KHARB P. and BAUM S.

Abstract (from CDS):

We extend and apply a model-independent analysis method developed earlier by Daly & Djorgovski to new supernova, radio galaxy, and galaxy cluster samples to study the acceleration history of the universe and the properties of the dark energy. There is good agreement between results obtained with radio galaxies and supernovae, suggesting that both distance indicators are reliable. The deceleration parameter q(z) is obtained assuming only the validity of the FRW metric, allowing for a range of values of space curvature, and independent of a gravity theory and the physical nature of the contents of the universe. We show that q0 is independent of space curvature, and obtain q0=-0.48±0.11. The transition redshift when q0=0 is zT=0.78+0.08–0.27 for zero space curvature, and has a weak dependence on space curvature. We find good agreement between model-independent quantities and those predicted by general relativity, indicating that GR provides a good description of the data over look-back times of ten billion years.

Abstract Copyright:

Journal keyword(s): Cosmology: Cosmological Parameters - Cosmology: Observations - Cosmology: Theory - Cosmology: Dark Matter - Equation of State

VizieR on-line data: <Available at CDS (J/ApJ/677/1): table1.dat>

CDS comments: In table1, sn1977ff is probably a misprint for sn1997ff.

Simbad objects: 260

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2008ApJ...677....1D and select 'bookmark this link' or equivalent in the popup menu


2020.02.18-05:11:24

© Université de Strasbourg/CNRS

    • Contact