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• W4285156104 abstract "ABSTRACT We re-examine the contentious question of constraints on anisotropic expansion from Type Ia supernovae (SNIa) in the light of a novel determination of peculiar velocities, which are crucial to test isotropy with SNe out to distances ⪝200h-1 Mpc. We re-analyse the Joint Light-Curve Analysis (JLA) Supernovae (SNe) data, improving on previous treatments of peculiar velocity corrections and their uncertainties (both statistical and systematic) by adopting state-of-the-art flow models constrained independently via the 2M++ galaxy redshift compilation. We also introduce a novel procedure to account for colour-based selection effects, and adjust the redshift of low-z SNe self-consistently in the light of our improved peculiar velocity model. We adopt the Bayesian hierarchical model BAHAMAS to constrain a dipole in the distance modulus in the context of the Lambda cold dark matter (ΛCDM) model and the deceleration parameter in a phenomenological Cosmographic expansion. We do not find any evidence for anisotropic expansion, and place a tight upper bound on the amplitude of a dipole, |Dμ| &lt; 5.93 × 10−4 (95 per cent credible interval) in a ΛCDM setting, and $|D_{q_0}| lt 6.29 times 10^{-2}$ in the Cosmographic expansion approach. Using Bayesian model comparison, we obtain posterior odds in excess of 900:1 (640:1) against a constant-in-redshift dipole for ΛCDM (the Cosmographic expansion). In the isotropic case, an accelerating universe is favoured with odds of ∼1100:1 with respect to a decelerating one." @default.
• W4285156104 created "2022-07-14" @default.
• W4285156104 creator A5006579657 @default.
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• W4285156104 creator A5038270074 @default.
• W4285156104 creator A5038831857 @default.
• W4285156104 creator A5049262683 @default.
• W4285156104 date "2022-05-03" @default.
• W4285156104 modified "2023-10-17" @default.
• W4285156104 title "New constraints on anisotropic expansion from supernovae Type Ia" @default.
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