Constraining the Anisotropy of the Universe from Supernovae and Gamma-ray Bursts

Abstract

Recently, an anisotropic cosmological model was proposed. An arbitrary 1-form, which picks out a privileged axis in the universe, was added to the Friedmann-Robertson-Walker line element. The distance-redshift relation was modified such that it is direction dependent. In this paper, we use the Union2 dataset and 59 high-redshift gamma-ray bursts to give constraints on the anisotropy of the universe. The results show that the magnitude of anisotropy is about $D=-0.044\pm 0.018$, and the privileged axis points towards the direction $(l_0,b_0)=(306.1^{\circ }\pm 18.7^{\circ },-18.2^{\circ }\pm 11.2^{\circ })$ in the galactic coordinate system. The anisotropy is small and the isotropic cosmological model is an excellent approximation.

10 pages, 3 figures

References in corpus (4)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• The Hubble Diagram to Redshift >6 from 69 Gamma-Ray Bursts
• Optimal limits on f_{NL}^{local} from WMAP 5-year data

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• Finslerian dipolar modulation of the CMB power spectra at scales $2<l<600$
• Lorentz Violation in Finsler Geometry
• The Two-Point Correlation Function of Gamma-ray Bursts