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The Ellis-Baldwin test.
1U.S. Naval Observatory, 3450 Massachusetts Ave. NW, Washington, DC 20392-5420, USA.
Summary
The Ellis-Baldwin test reveals an anomalously large dipole in distant source counts, challenging the Cosmological Principle. This finding questions the standard Lambda-CDM model
Area of Science:
- Cosmology
- Astrophysics
- Large-scale structure
Background:
- The standard Lambda-Cold Dark Matter (ΛCDM) model relies on the Cosmological Principle: the universe is isotropic and homogeneous on large scales.
- The Cosmic Microwave Background (CMB) dipole anisotropy is interpreted as our motion relative to this large-scale structure (approx. 370 km/s).
- The Ellis-Baldwin test provides an independent method to verify this motion by analyzing distant radio source and quasar counts.
Purpose of the Study:
- To review the Ellis-Baldwin test and its application in cosmology.
- To highlight the anomalous results obtained from recent Ellis-Baldwin tests.
- To discuss the implications of these anomalies for the foundational assumptions of the ΛCDM model.
Main Methods:
- Analysis of large catalogues of radio sources and quasars.
- Measurement of the dipole anisotropy in the counts of these distant sources.
- Comparison of the observed dipole with the prediction derived from the CMB dipole.
Main Results:
- Subsequent Ellis-Baldwin tests consistently reveal a dipole anomaly.
- The observed dipole is 2-3 times larger than predicted by the kinematic interpretation of the CMB dipole.
- This anomaly has reached a statistical significance exceeding [Formula: see text].
Conclusions:
- The anomalous Ellis-Baldwin test results challenge the Cosmological Principle.
- This discrepancy poses a significant threat to the validity of FLRW-based cosmological models, including ΛCDM.
- Further research is needed to resolve this tension and understand its cosmological implications.