Isotropy of low redshift type Ia Supernovae: A Bayesian analysis

Abstract

The standard cosmology strongly relies upon the Cosmological Principle, which consists on the hypotheses of large scale isotropy and homogeneity of the Universe. Testing these assumptions is, therefore, crucial to determining if there are deviations from the standard cosmological paradigm. In this paper, we use the latest type Ia supernova compilations, namely JLA and Union2.1 to test the cosmological isotropy at low redshift ranges ($z<0.1$). This is performed through a Bayesian selection analysis, in which we compare the standard, isotropic model, with another one including a dipole correction due to peculiar velocities. We find that the Union2.1 sample favors the dipole-corrected model, but the opposite happens for the JLA. Nonetheless, the velocity dipole results are in good agreement with previous analyses carried out with both datasets. We conclude that there are no significant indications for large anisotropic signals from nearby supernova compilations, albeit this test should be greatly improved with the upcoming cosmological surveys.

7 pages, 3 figures, 3 tables

References in corpus (10)

• Bayes in the sky: Bayesian inference and model selection in cosmology
• Dipole of the luminosity distance: a direct measure of H(z)
• The Dipole Repeller
• The peculiar velocity field: constraining the tilt of the Universe
• Probing bulk flow with nearby SNe Ia data
• Testing Isotropy in the Local Universe
• Constraining the Anisotropy of the Universe from Supernovae and Gamma-ray Bursts
• Narrowing down the possible explanations of cosmic acceleration with geometric probes
• CMB constraints on $\beta$-exponential inflationary models
• Determining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae

Cited by in corpus (28)

• Extended Gravity Cosmography
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Constraints on a Bianchi type I spacetime extension of the standard $\Lambda$CDM model
• Hints of FLRW Breakdown from Supernovae
• Anisotropy of the Universe via the Pantheon supernovae sample revisited
• Anisotropic cosmological reconstruction in $f(R,T)$ gravity
• Cosmological perturbations in the Tsallis holographic dark energy scenarios
• Constraining the anisotropy of the Universe via Pantheon supernovae sample
• Percent-Level Test of Isotropic Expansion Using Type Ia Supernovae
• Bayesian Comparison of Interacting Scenarios
• Modeling Transit Dark Energy in $f(R,L_m)$-gravity
• Testing cosmic anisotropy with Pantheon sample and quasars at high redshifts
• Bianchi Type I model of universe with customized scale factors
• A Model-independent Test of Cosmic Isotropy with Low-z Pantheon Supernovae
• Testing the Cosmic Anisotropy with Supernovae Data: Hemisphere Comparison and Dipole Fitting
• Revisiting the statistical isotropy of GRB sky distribution
• Transit String Dark Energy Models in $f(Q)$ Gravity
• The quadrupole in the local Hubble parameter: first constraints using Type Ia supernova data and forecasts for future surveys
• Extended $\Lambda$CDM model
• A tomographic test of cosmological principle using the JLA compilation of type Ia supernovae
• Cosmic Anisotropy and Fast Radio Bursts
• Extended $\Lambda$CDM model and viscous dark energy: A Bayesian analysis
• Consistency of Pantheon+ supernovae with a large-scale isotropic universe
• Bayesian Comparison of Interacting Modified Holographic Ricci Dark Energy Scenarios
• Is the local Hubble flow consistent with concordance cosmology?
• Bayesian analysis of running holographic Ricci dark energy
• New Constraints on Anisotropic Expansion from Supernovae Type Ia
• Dipole of the luminosity distance as a test for dark energy models