AI Insight
This brief communication refutes a recent claim by Ray et al. that disputed the anisotropic acceleration of the universe's expansion. The authors identify a critical error in the disputed paper: Ray et al. confused Equatorial and Galactic coordinate systems, resulting in an incorrect determination of the CMB dipole direction. This coordinate system error invalidates Ray et al.'s conclusion that supernova data shows isotropic acceleration in both CMB dipole and anti-dipole hemispheres, thereby failing to contradict the original finding of dipole anisotropy in the Hubble expansion rate.
Why it matters
This correction is significant for cosmology as it maintains the evidence for anisotropic expansion of the universe, which has important implications for our understanding of dark energy and the large-scale structure of the cosmos. Resolving such fundamental measurement disputes is crucial for determining whether the universe's expansion is truly accelerating uniformly in all directions.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: Ray et al. [1] have claimed that the acceleration of the Hubble expansion rate inferred from Type Ia supernovae in the Pantheon+ catalogue “is equally strong in the CMB dipole ($q_m = + 1.45$) and anti-dipole hemispheres ($+ 1.55$), directly contradicting the SRS26 anisotropy argument”. Here SRS26 refers to our analysis [2] which showed that “locally $q_0$ has a strong dipole anisotropy aligned approximately with the bulk flow, and only a small monopole component remains at distances exceeding a few hundred Mpc”. We find that these authors confused Equatorial with Galactic coordinates, thereby getting the CMB dipole direction wrong. Hence their conclusion is baseless.