Redshift drift for tilted observers consists of an FLRW background term plus directional corrections from peculiar expansion, projected shear, and acceleration along the line of sight.
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Derives perturbation equations for Bianchi spacetimes in Newtonian gauge and computes density contrasts for EdS and Bianchi I models.
A Hubble-scale domain wall quintessence model produces anisotropic expansion but is tightly constrained by Planck CMB quadrupole limits and supernova data to a negligible contribution, favoring standard LambdaCDM.
Galaxy cluster observations yield two preferred directions with cosmic anisotropy amplitude of about 5.3 times 10 to the minus 4 at roughly 1 sigma overall significance, though higher in the XMM-Newton subsample.
Analysis of galaxy cluster and supernova data reveals a ~2σ directional variation in the Hubble constant, robust across calibration methods and aligned with the CMB dipole.
The 1+3 covariant formalism reproduces the standard result for peculiar velocity growth in cosmology and does not imply anomalous bulk flows or apparent acceleration.
citing papers explorer
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Expected redshift drift for tilted observers
Redshift drift for tilted observers consists of an FLRW background term plus directional corrections from peculiar expansion, projected shear, and acceleration along the line of sight.
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Fundamental Cosmic Anisotropy and its Ramifications II: Perturbations in Bianchi spacetimes, and fixed in the Newtonian gauge
Derives perturbation equations for Bianchi spacetimes in Newtonian gauge and computes density contrasts for EdS and Bianchi I models.
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Domain-wall Quintessence
A Hubble-scale domain wall quintessence model produces anisotropic expansion but is tightly constrained by Planck CMB quadrupole limits and supernova data to a negligible contribution, favoring standard LambdaCDM.
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New constraints on cosmic anisotropy from galaxy clusters using an improved dipole fitting method
Galaxy cluster observations yield two preferred directions with cosmic anisotropy amplitude of about 5.3 times 10 to the minus 4 at roughly 1 sigma overall significance, though higher in the XMM-Newton subsample.
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Probing cosmic anisotropy with galaxy clusters and supernovae
Analysis of galaxy cluster and supernova data reveals a ~2σ directional variation in the Hubble constant, robust across calibration methods and aligned with the CMB dipole.
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Cosmological peculiar velocities in general relativity
The 1+3 covariant formalism reproduces the standard result for peculiar velocity growth in cosmology and does not imply anomalous bulk flows or apparent acceleration.