How strong is the evidence for accelerated expansion?

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 (33)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• 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
• On average properties of inhomogeneous fluids in general relativity I: dust cosmologies
• A Map of the Universe
• The Hubble Constant: A Summary of the HST Program for the Luminosity Calibration of Type Ia Supernovae by Means of Cepheids
• SALT: a Spectral Adaptive Light curve Template for Type Ia Supernovae
• A kinematical approach to dark energy studies
• Observational constraints on low redshift evolution of dark energy: How consistent are different observations?
• Dark energy from backreaction
• Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant
• General Relativistic Energy Conditions: The Hubble expansion in the epoch of galaxy formation
• Uncorrelated Measurements of the Cosmic Expansion History and Dark Energy from Supernovae
• Effect of inhomogeneities on the expansion rate of the Universe
• The effect of inhomogeneous expansion on the supernova observations
• Is there Evidence for a Hubble bubble? The Nature of Type Ia Supernova Colors and Dust in External Galaxies
• Do SNe Ia Provide Direct Evidence for Past Deceleration of the Universe?
• (An)isotropy of the Hubble diagram: comparing hemispheres
• What Do We Really Know About Cosmic Acceleration?
• Energy Conditions and Cosmic Acceleration
• The supernova Hubble diagram for off-center observers in a spherically symmetric inhomogeneous universe
• The Hubble Constant
• Tension and Systematics in the Gold06 SnIa Dataset
• On the onset of cosmological backreaction
• Anisotropy in the Hubble constant as observed in the HST Extragalactic Distance Scale Key Project results
• Bayesian analysis of Friedmannless cosmologies
• Systematic corrections to the measured cosmological constant as a result of local inhomogeneity
• Cosmography, Decelerating Past, and Cosmological Models: Learning the Bayesian Way
• Direct evidence of acceleration from distance modulus redshift graph

Cited by in corpus (26)

• Light propagation in statistically homogeneous and isotropic dust universes
• Light propagation in statistically homogeneous and isotropic universes with general matter content
• Introducing the Dirac-Milne universe
• The evidence of cosmic acceleration and observational constraints
• How to Distinguish Dark Energy and Modified Gravity?
• Swiss Cheese and a Cheesy CMB
• Dark energy as a mirage
• Model independent constraints on the cosmological expansion rate
• Model-independent cosmic acceleration and type Ia supernovae intrinsic luminosity redshift dependence
• Is the Hubble diagram of quasars in tension with concordance cosmology?
• Energy conditions bounds and their confrontation with supernovae data
• Is dark energy an effect of averaging?
• Model- and calibration-independent test of cosmic acceleration
• Model-Independent Reconstruction of the Expansion History of the Universe from Type Ia Supernovae
• Violation of the FRW consistency condition as a signature of backreaction
• {\it Gauging} the cosmic acceleration with recent type Ia supernovae data sets
• Backreaction and FRW consistency conditions
• Generalised model-independent characterisation of strong gravitational lenses V: reconstructing the lensing distance ratio by supernovae for a general Friedmann universe
• Cosmological Parameter Estimation from SN Ia data: a Model-Independent Approach
• Energy conditions bounds and supernovae data
• On the luminosity distance and the epoch of acceleration
• Null tests with Gaussian Process
• Evaluating backreaction with the ellipsoidal collapse model
• Cosmic acceleration and the Hubble tension from baryon acoustic oscillation data
• Testing the Constancy of Type Ia Supernova Luminosities with Gaussian Process
• On the accelerated expansion of the cosmos