Kinematic dipole detection with galaxy surveys: forecasts and requirements

Abstract

Upcoming or future deep galaxy samples with wide sky coverage can provide independent measurement of the kinematic dipole - our motion relative to the rest frame defined by the large-scale structure. Such a measurement would present an important test of the standard cosmological model, as the standard model predicts the galaxy measurement should precisely agree with the existing precise measurements made using the CMB. However, the required statistical precision to measure the kinematic dipole typically makes the measurement susceptible to bias from the presence of the local-structure-induced dipole contamination. In order to minimize the latter, a sufficiently deep survey is required. We forecast both the statistical error and the systematic bias in the kinematic dipole measurements. We find that a survey covering $\sim 75\%$ of the sky in both hemispheres and having $\sim 30$ million galaxies can detect the kinematic dipole at $5\sigma$, while its median redshift should be at least $z_{med}\sim 0.75$ for negligible bias from the local structure.

Minor changes; matches the published version

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• Interpreting the CMB aberration and Doppler measurements: boost or intrinsic dipole?
• Reconstructing the Primary CMB Dipole
• The dipole anisotropy of WISE x SuperCOSMOS number counts
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• The CMB, preferred reference system and dragging of light in the earth frame
• Cosmic Background Radiation and `ether-drift' experiments
• A forecast for the detection of the power asymmetry from galaxy surveys
• Probing the Cosmological Principle with the CSST Photometric Survey
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• Michelson-Morley Experiments: at the crossroads of Relativity, Cosmology and Quantum Physics
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• The large-scale monopole of the power spectrum in a Euclid-like survey: wide-angle effects, lensing, and the `finger of the observer'
• Cosmic Dipoles from Large-Scale Structure Surveys