Deviation from the Cosmological Constant or Systematic Errors?

Abstract

Motivated by the fact that both SNe Ia and GRBs seem to prefer a dark energy EOS greater than -1 at redshifts $z\gtrsim 0.5$, we perform a careful investigation on this situation. We find that the deviation of dark energy from the cosmological constant at redshifts $z\gtrsim 0.5$ is large enough that we should pay close attention to it with future observational data. Such a deviation may arise from some biasing systematic errors in the handling of SNe Ia and/or GRBs or more interestingly from the nature of the dark energy itself.

4 pages, 4 figures, added references

References in corpus (23)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• The 3D power spectrum of galaxies from the SDSS
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• Two new diagnostics of dark energy
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• Is there Supernova Evidence for Dark Energy Metamorphosis ?
• The Hubble Diagram to Redshift >6 from 69 Gamma-Ray Bursts
• Uncorrelated Estimates of Dark Energy Evolution
• A time - luminosity correlation for Gamma Ray Bursts in the X - rays
• A Cosmology-Independent Calibration of Gamma-Ray Burst Luminosity Relations and the Hubble Diagram
• Model-Independent Distance Measurements from Gamma-Ray Bursts and Constraints on Dark Energy
• Exploring the Properties of Dark Energy Using Type Ia Supernovae and Other Datasets
• Testing GRBs as Standard Candles
• Overcoming the Circular Problem for γ-ray Bursts in Cosmological Global Fitting Analysis
• Narrowing Constraints with Type Ia Supernovae: Converging on a Cosmological Constant
• Constraining the evolution of dark energy with type Ia supernovae and gamma-ray bursts

Cited by in corpus (23)

• Discovery of a tight correlation for gamma ray burst afterglows with `canonical' light curves
• Gamma-ray Burst Cosmology
• A fundamental plane for long gamma-ray bursts with X-ray plateaus
• Measuring dark energy with the $E_{\mathrm{iso}}-E_{\mathrm{p}}$ correlation of gamma-ray bursts using model-independent methods
• A Study of the Gamma-Ray Burst Fundamental Plane
• The updated luminosity correlations of gamma-ray bursts and cosmological implications
• A Comparison of Thawing and Freezing Dark Energy Parametrizations
• Constraints on Cosmological Models and Reconstructing the Acceleration History of the Universe with Gamma-Ray Burst Distance Indicators
• Constraints on the generalized Chaplygin gas model including gamma-ray bursts via a Markov Chain Monte Carlo approach
• Tension in the Recent Type Ia Supernovae Datasets
• $E_{\mathrm{iso}}$-$E_{\mathrm{p}}$ correlation of gamma ray bursts: calibration and cosmological applications
• Calibration of GRB Luminosity Relations with Cosmography
• Weak gravitational lensing effects on cosmological parameters and dark energy from gamma-ray bursts
• Distance Measurements from Supernovae and Dark Energy Constraints
• Probing the dynamical behavior of dark energy
• A new luminosity relation for gamma-ray bursts and its implication
• Toward tight gamma-ray burst luminosity relations
• Cosmological Constraints on the DGP braneworld model with Gamma-ray bursts
• Estimating the uncorrelated dark energy evolution in the Planck era
• GRBs and fundamental physics
• Observational constraint on dynamical evolution of dark energy
• Analysis of recent type Ia supernova data based on evolving dark energy models
• Latest Cosmological Constraints on Cardassian expansion models including the updated Gamma-ray bursts