High-z Supernova Type Ia Data: non-Gaussianity and Direction Dependence
arXiv:1401.4527 · doi:10.1093/mnras/stu416
Abstract
We use the statistic introduced in \cite{gup08,gup10} to study directional dependence, in the high-z supernovae data. This dependence could arise due to departures from the cosmological principle or from direction dependent statistical systematics in the data. We apply our statistic to the gold data set from \cite{rie04} and \cite{rie07}, and Union2 catalogue from \cite{aman10}. Our results show that all the three data sets show a weak but consistent direction dependence. In 2007 data errors are Gaussian, however other two data sets show non-Gaussian features.
arXiv comment5 pages, 5 figures, 2 tables; submitted to MNRAS. arXiv admin note: substantial text overlap with arXiv:1005.2868
References in corpus (35)
- 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
- Dark Energy and the Accelerating Universe
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
- Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
- 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
- Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
- Reconstructing Dark Energy
- Indications of a spatial variation of the fine structure constant
- Approaches to Understanding Cosmic Acceleration
- Comparison of the Legacy and Gold SnIa Dataset Constraints on Dark Energy Models
- Consistently Large Cosmic Flows on Scales of 100 Mpc/h: a Challenge for the Standard LCDM Cosmology
- A comparison of cosmological models using recent supernova data
- Cosmological constraints from Archeops
- A Local Hubble Bubble from SNe Ia?
- The non-Gaussian Cold Spot in WMAP: significance, morphology and foreground contribution
- Searching for a Cosmological Preferred Axis: Union2 Data Analysis and Comparison with Other Probes
- A Cosmic Microwave Background feature consistent with a cosmic texture
- CMB multipole measurements in the presence of foregrounds
- Is there Correlation between Fine Structure and Dark Energy Cosmic Dipoles?
- Tension and Systematics in the Gold06 SnIa Dataset
- Constraints on anisotropic cosmic expansion from supernovae
- Constraining the Anisotropic Expansion of Universe
- Direction Dependence of the Deceleration Parameter
- Anisotropy in the Hubble constant as observed in the HST Extragalactic Distance Scale Key Project results
- Searching for a preferred direction with Union2.1 data
- Supernovae as seen by off-center observers in a local void
- Direction Dependent Non-gaussianity in High-z Supernova Data
- Direction Dependence in Supernova Data: Constraining Isotropy
- Evidence for Evolution or Bias in Host Extinctions of Type 1a Supernovae at High Redshift
- Search for Global Metric Anisotropy in Type Ia Supernova Data
- Non-Gaussianity and direction dependent systematics in HST key project data