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Potential signature of a quadrupolar hubble expansion in Pantheon+ supernovae
JA Cowell, S Dhawan… - Monthly Notices of the …, 2023 - academic.oup.com
The assumption of isotropy–that the Universe looks the same in all directions on large
scales–is fundamental to the standard cosmological model. It is therefore critical to …
scales–is fundamental to the standard cosmological model. It is therefore critical to …
Testing spatial curvature and anisotropic expansion on top of the ΛCDM model
We explore the possible advantages of extending the standard Λ CDM model by more
realistic backgrounds compared to its spatially flat Robertson–Walker (RW) spacetime …
realistic backgrounds compared to its spatially flat Robertson–Walker (RW) spacetime …
Multipole expansion of the local expansion rate
B Kalbouneh, C Marinoni, J Bel - Physical Review D, 2023 - APS
We design a new observable, the expansion rate fluctuation η, to characterize deviations
from the linear relation between redshift and distance in the local universe. We also show …
from the linear relation between redshift and distance in the local universe. We also show …
Constraining the anisotropy of the Universe with the Pantheon supernovae sample
Z Chang, D Zhao, Y Zhou - Chinese Physics C, 2019 - iopscience.iop.org
We test the possible dipole anisotropy of the Finslerian cosmological model and the other
three dipole-modulated cosmological models, ie the dipole-modulated ΛCDM, wCDM and …
three dipole-modulated cosmological models, ie the dipole-modulated ΛCDM, wCDM and …
Anisotropy of the Universe via the Pantheon supernovae sample revisited
D Zhao, Y Zhou, Z Chang - Monthly Notices of the Royal …, 2019 - academic.oup.com
We employ the hemisphere comparison (HC) method and the dipole fitting (DF) method to
investigate the cosmic anisotropy in the recently released Pantheon sample of type Ia …
investigate the cosmic anisotropy in the recently released Pantheon sample of type Ia …
Testing cosmic anisotropy with Pantheon sample and quasars at high redshifts
In this paper, we investigate the cosmic anisotropy from the SN-Q sample, consisting of the
Pantheon sample and quasars, by employing the hemisphere comparison (HC) method and …
Pantheon sample and quasars, by employing the hemisphere comparison (HC) method and …
Consistency of Pantheon+ supernovae with a large-scale isotropic universe
L Tang, HN Lin, L Liu, X Li - Chinese Physics C, 2023 - iopscience.iop.org
We investigate the possible anisotropy of the universe using data on the most up-to-date
type Ia supernovae, ie., the Pantheon+ compilation. We fit the full Pantheon+ data with the …
type Ia supernovae, ie., the Pantheon+ compilation. We fit the full Pantheon+ data with the …
A tomographic test of cosmic anisotropy with the recently-released quasar sample
D Zhao, JQ **a - The European Physical Journal C, 2021 - Springer
We test the cosmic anisotropy in the dipole-modulated Λ Λ CDM model and Finslerian
cosmological model with the recently-released quasar sample. Based on the redshift …
cosmological model with the recently-released quasar sample. Based on the redshift …
Constraining the anisotropy of the Universe with the X-ray and UV fluxes of quasars
D Zhao, JQ **a - The European Physical Journal C, 2021 - Springer
We test the anisotropy in the Finslerian cosmological model with the X-ray and ultraviolet
(UV) fluxes of quasars. The 2015 and 2020 compilations of quasars are used in the …
(UV) fluxes of quasars. The 2015 and 2020 compilations of quasars are used in the …
A model-independent test of cosmic isotropy with low-z pantheon supernovae
The assumption of homogeneity and isotropy on large scales is one of the main hypotheses
of the standard cosmological model. In this paper, we revisit a test of cosmological isotropy …
of the standard cosmological model. In this paper, we revisit a test of cosmological isotropy …