Exploring the cosmological consequences of JLA supernova data with improved flux-averaging technique

Abstract

In this work, we explore the cosmological consequences of the "Joint Light-curve Analysis" (JLA) supernova (SN) data by using an improved flux-averaging (FA) technique, in which only the type Ia supernovae (SNe Ia) at high redshift are flux-averaged. Adopting the criterion of figure of Merit (FoM) and considering six dark energy (DE) parameterizations, we search the best FA recipe that gives the tightest DE constraints in the $(z_{cut},\Delta z)$ plane, where $z_{cut}$ and $\Delta z$ are redshift cut-off and redshift interval of FA, respectively. Then, based on the best FA recipe obtained, we discuss the impacts of varying $z_{cut}$ and varying $\Delta z$, revisit the evolution of SN color luminosity parameter $\beta$, and study the effects of adopting different FA recipe on parameter estimation. We find that: (1) The best FA recipe is $(z_{cut}=0.6,\Delta z=0.06)$, which is insensitive to a specific DE parameterization. (2) Flux-averaging JLA samples at $z_{cut}\ge 0.4$ will yield tighter DE constraints than the case without using FA. (3) Using FA can significantly reduce the redshift-evolution of $\beta$. (4) The best FA recipe favors a larger fractional matter density ${\Omega }_m$. In summary, we present an alternative method of dealing with JLA data, which can reduce the systematic uncertainties of SNe Ia and give the tighter DE constraints at the same time. Our method will be useful in the use of SNe Ia data for precision cosmology.

17 pages, 5 figures, 2 tables, Accepted for Publication in JCAP

References in corpus (27)

• Dynamics of dark energy
• Dark Energy and the Accelerating Universe
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• A Holographic Dark Energy Model from Ricci Scalar Curvature
• WMAP constraints on low redshift evolution of dark energy
• Holographic dark energy models: A comparison from the latest observational data
• A parametric model for dark energy
• Dynamical Dark Energy or Simply Cosmic Curvature?
• Figure of Merit for Dark Energy Constraints from Current Observational Data
• Alleviation of Cosmic Age Problem In Interacting Dark Energy Model
• Holographic dark energy in a universe with spatial curvature and massive neutrinos: a full Markov Chain Monte Carlo exploration
• Acceleration of the universe: a reconstruction of the effective equation of state
• Fitting the Constitution SNIa Data with Redshift Binned Parameterization Method
• Revisit of cosmic age problem
• Effects of time-varying $\beta$ in SNLS3 on constraining interacting dark energy models
• 3-loop Yang-Mills Condensate Dark Energy Model And Its Cosmological Constraints
• Exploring the Latest Union2 SNIa Dataset by Using Model-Independent Parametrization Methods
• Testing modified gravity models with recent cosmological observations
• Application of Bayesian graphs to SN Ia data analysis and compression
• More Evidence for the Redshift Dependence of Color from the JLA Supernova Sample Using Redshift Tomography
• Effects of a time-varying color-luminosity parameter $\beta$ on the cosmological constraints of modified gravity models
• A closer look at the cosmological implications of the $\Lambda$HDE model

Cited by in corpus (11)

• Holographic Dark Energy
• Dark energy reconstruction based on the PADE approximation; an expansion around the $\Lambda$CDM
• A tomographic test of cosmological principle using the JLA compilation of type Ia supernovae
• Growth of perturbations in dark energy parametrization scenarios
• Comparing dark energy models with current observational data
• Implications of JLA data for $k-$essence model of dark energy with given equation of state
• Time-dependent diffusive interactions between dark matter and dark energy in the context of $k-$essence cosmology
• Diffusive dark matter and dark energy scenario and $k-$essence in the context of Supernova Ia observations
• Probing Cosmic Acceleration by Using Model-Independent Parametrizations and Three Kinds of Supernova Statistics Techniques
• Modified scaling in $k$-essence model in interacting dark energy - dark matter scenario
• Dynamical analysis of $k$-essence cosmology in the light of Supernova Ia observations