How strong is the evidence for accelerated expansion?
arXiv:0711.3180 · doi:10.1088/1475-7516/2008/02/007
Abstract
We test the present expansion of the universe using supernova type Ia data without making any assumptions about the matter and energy content of the universe or about the parameterization of the deceleration parameter. We assume the cosmological principle to apply in a strict sense. The result strongly depends on the data set, the light-curve fitting method and the calibration of the absolute magnitude used for the test, indicating strong systematic errors. Nevertheless, in a spatially flat universe there is at least a 5 sigma evidence for acceleration which drops to 1.8 sigma in an open universe.
16 pages, 3 figures
References in corpus (8)
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
- Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
- Energy Conditions and Cosmic Acceleration
- On the onset of cosmological backreaction
- Anisotropy in the Hubble constant as observed in the HST Extragalactic Distance Scale Key Project results
- Systematic corrections to the measured cosmological constant as a result of local inhomogeneity
- Direct evidence of acceleration from distance modulus redshift graph