Transition redshift: new kinematic constraints from supernovae
By J. V. Cunha, J. A. S. Lima. 2008
184 citations recorded by the source corpus.
The transition redshift (deceleration/acceleration) is discussed by expanding the deceleration parameter to first order around its present value. A detailed study is carried out by considering two different parametrizations, q = q0 + q and q = q0 + q1 z(1 + z) -1 , and the associated free parameters (q0, q1 ) are constrained by three different supernovae (SNe) samples. A previous analysis by Riess et al. using the first expansion is slightly improved and confirmed in light of their recent data (Gold07 sample). However, by fitting the model with the Supernova Legacy Survey (SNLS) type Ia sample, we find that the best fit to the redshift transition is Zt = 0.61, instead of z t = 0.46 as derived by the High-z Supernovae Search (HZSNS) team. This result based in the SNLS sample is also in good agreement with the sample of Davis et al., z t = 0.60 +0.28 -0.11 (1σ). Such results are in line with some independent analyses and accommodate more easily the concordance flat model (ACDM). For both parametrizations, the three SNe Ia samples considered favour recent acceleration and past deceleration with a high degree of statistical confidence level. All the kinematic results presented here depend neither on the validity of general relativity nor on the matter-energy contents of the Universe.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/a9052b4529244a20387d79f51769dbe853856bf6
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
In Instrumentation
Citations in the corpus
- Expansion History with Decaying Vacuum: A Complete Cosmological Scenario (2012, methodology): “…constant term c0, permits the smooth transition from a deceleration to an acceleration phase as required from Supernovae observations either in the dynamics as well as in the kinematic descriptions (Turner & Riess 2002; Cunha & Lima 2008; Guimarães, Cunha & Lima 2009, Guimarães & Lima 2011).”
- Cosmological Models with Linearly Varying Deceleration Parameter (2011, methodology): “ccelerating stage of the universe, which does not depend on the validity of general relativity, as well as on the matter-energy content of the universe [1]. By assuming a spatially flat universe Cunha [1] finds that qz=0 = −0.73 and zt = 0.49. Now, to demonstrate how LVDP matches the observed kinemati”