Multipole decomposition of redshift drift -- model independent mapping of the expansion history of the Universe

Abstract

We consider redshift drift in a general space-time as expressed in terms of physically interpretable multipole series. An important realisation from the derived results is that redshift drift cannot in general be thought of as a direct probe of the average expansion rate of the Universe due to the presence of structure along the light beams from the astrophysical sources to the observer. We also predict the general presence of a dipolar and a quadrupolar offset in the detection of redshift drift for observers placed in locally anisotropic environments.

arXiv comment4 pages

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Cited by in corpus (20)

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• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• An effective description of Laniakea: impact on cosmology and the local determination of the Hubble constant
• Backreaction in Cosmology
• What is flat ΛCDM, and may we choose it?
• Redshift drift as a model independent probe of dark energy
• Redshift drift cosmography for model-independent cosmological inference
• Constraining minimally extended varying speed of light by cosmological chronometers
• Machine learning cosmic backreaction and its effects on observations
• Cosmic backreaction and the mean redshift drift from symbolic regression
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• Effect of inhomogeneities on the propagation of gravitational waves from binaries of compact objects
• Redshift drift in a universe with structure II: Light rays propagated through a Newtonian N-body simulation
• Perturbations of Cosmological Redshift Drift
• Redshift drift in a universe with structure III: Numerical relativity
• Redshift Drift fluctuations from N-body simulations
• The averaging problem on the past null cone in inhomogeneous dust cosmologies