Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way

Testing the isotropy of the Universe with Type Ia supernovae in a model-independent way

Abstract In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parame...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2018-03, Vol.474 (3), p.3516-3522
Hauptverfasser: Wang, Yu-Yang, Wang, F Y
Format: Artikel
Sprache:eng
Schlagworte:
Anisotropy
Astronomical models
Computer simulation
Constraint modelling
Cosmology
Dark energy
Energy equation
Equations of state
Isotropy
Markov analysis
Markov chains
Monte Carlo simulation
Parameters
Supernovae
Universe
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Zusammenfassung:Abstract In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint light-curve analysis (JLA) sample of Type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, we fit the SNe Ia light-curve parameters and cosmological parameters simultaneously employing Markov chain Monte Carlo method. Therefore, the results on the amount of deviation from isotropy of the dark energy equation of state (δ), and the level of anisotropy of the large-scale geometry (Σ0) at present, are totally model-independent. The constraints on the skewness and cosmic shear are −0.101 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stx2982