What question did this study set out to answer?

The research aims to measure cosmic dipole anisotropy using quasar observational data.

March 29, 2026Open Access

Cosmic Dipole Anomaly and Matter Distribution Anisotropy Paper XVIII

Key Points

The research aims to measure cosmic dipole anisotropy using quasar observational data.
Analyzed 13,017 quasars from the Secrest et al. (2021) catalog.
Measured dipole magnitude and spatial coordinates.
Performed bootstrap resampling over 50 iterations.
Confirmed findings through systematic robustness tests.
Detected a cosmic dipole of 4226.3±1875.3 km/s.
Achieved a 2.25σ detection with a 68% confidence interval.
Found the dipole approximately 6 times larger than the CMB dipole.
Support for cosmic anisotropies incompatible with standard ΛCDM isotropy.

Abstract

We present a direct measurement of the cosmic dipole anisotropy using real observational data from the Secrest et al. (2021) quasar catalog. Our analysis of 13,017 quasars spanning redshifts 0.3<z<2.5 reveals a significant cosmic dipole of magnitude 4226.3±1875.3 km/s located at RA 162.11, Dec 71.74. Bootstrap resampling over 50 iterations yields a 2.25σ detection with a 68% confidence interval of 2216.8–6195.5 km/s. The detected dipole is approximately 6 times larger than the CMB dipole (∼600 km/s), suggesting genuine large-scale anisotropies in matter distribution at higher redshifts. This represents an independent confirmation of large-scale cosmic anisotropy and provides crucial validation of quasar-based dipole measurements. All systematic robustness tests confirm results are independent of methodological choices. These findings support the existence of cosmic anisotropies incompatible with standard ΛCDM isotropy assumptions.

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