Constraining the anisotropy of the Universe via Pantheon supernovae sample

Abstract

We test the possible dipole anisotropy of a Finslerian cosmological model and other three dipole-modulated cosmological models, i.e., the dipole-modulated $\mathrm{\Lambda }$CDM, $w$CDM and Chevallier--Polarski--Linder (CPL) model by using the recently released Pantheon sample of SNe Ia. The Markov chain Monte Carlo (MCMC) method is used to explore the whole parameter space. We find that the dipole anisotropy is very weak in all cosmological models used. Although the dipole amplitudes of four cosmological models are consistent with zero within $1\sigma$ uncertainty, the dipole directions are close to the axial direction to the plane of SDSS subsample among Pantheon. It may imply that the weak dipole anisotropy in the Pantheon sample originates from the inhomogeneous distribution of the SDSS subsample. More homogeneous distribution of SNe Ia is necessary to constrain the cosmic anisotropy.

11 pages, 6 figures, 1 table, accepted by Chinese Physics C

References in corpus (13)

• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Spatial variation in the fine-structure constant -- new results from VLT/UVES
• Anisotropic Dark Energy: Dynamics of Background and Perturbations
• Dipole of the luminosity distance: a direct measure of H(z)
• New constraints on Parity Symmetry from a re-analysis of the WMAP-7 low resolution power spectra
• Probing the anisotropic expansion from supernovae and GRBs in a model-independent way
• Anisotropy of the Universe via the Pantheon supernovae sample revisited
• Testing the isotropy of the Universe with type Ia supernovae in a model-independent way
• Comparison between hemisphere comparison method and dipole-fitting method in tracing the anisotropic expansion of the Universe use the Union2 dataset
• Constraining anisotropy of the universe from different groups of type-Ia supernovae
• A unified description for dipoles of the fine-structure constant and SnIa Hubble diagram in Finslerian universe
• Constraining the Anisotropy of the Universe from Supernovae and Gamma-ray Bursts
• Searching for a cosmological preferred direction with 147 rotationally supported galaxies

Cited by in corpus (21)

• On the evolution of the Hubble constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: a feasibility study for GRB-cosmology in 2030
• Hints of FLRW Breakdown from Supernovae
• Hints of a Local Matter Underdensity or Modified Gravity in the Low $z$ Pantheon data
• On the impact of $f(Q)$ gravity on the Large Scale Structure
• Constraining effective equation of state in $f(Q,T)$ gravity
• Viscous cosmology in the Weyl-type $f(Q,T)$ gravity
• Constraining the $f(R,T)=R+2\lambda T$ cosmological model using recent observational data
• Interaction of divergence-free deceleration parameter in Weyl-type $f(Q,T)$ gravity
• A model-independent method with phantom divide line crossing in Weyl-type $f(Q,T)$ gravity
• Constraining the anisotropy of the Universe with the X-ray and UV fluxes of quasars
• Observational Constraints on Hybrid Scale Factor in f(Q,T) Gravity with Anisotropic Space-Time
• Consistency of Pantheon+ supernovae with a large-scale isotropic universe
• Cosmological constraints on time-varying cosmological terms: A study of FLRW universe models with $\Lambda (t)$CDM cosmology
• Signature flips in time-varying $\Lambda (t)$ cosmological models with observational data
• Stability analysis of two-fluid dark energy models
• Square-Root parametrization of dark energy in $f(Q)$ cosmology
• Scalar field dark energy: Insights into cosmological evolution and black hole accretion
• Impact of dark energy on the equation of state in light of the latest cosmological data
• Constraining hybrid potential scalar field cosmological model in Lyra's geometry with recent observational data
• Redshift evolution of the Hubble constant: Constraints and new insights from an interacting dark energy model
• Investigating the compatibility of exact solutions in Weyl-type $f(Q,T)$ gravity with observational data