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Related Experiment Video

Updated: Jul 11, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 16, 2013

Cosmological implications of a large complete quasar sample

I E Segal¹, J F Nicoll

¹Massachusetts Institute of Technology, Room 2-244, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Proceedings of the National Academy of Sciences of the United States of America

|May 9, 1998

Summary

This summary is machine-generated.

The Friedman-Lemaître cosmology (C1) significantly deviates from quasar observations, while chronometric cosmology (C2) shows excellent agreement. Quasar evolution, used to explain C1 deviations, may be a theoretical artifact.

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Area of Science:

Cosmology
Astrophysics
Observational Astronomy

Background:

Cosmological models aim to explain the universe's expansion.
Quasar properties provide crucial data for testing these models.
Discrepancies between theory and observation necessitate model refinement or alternative explanations.

Purpose of the Study:

To quantitatively assess deviations between theoretical cosmological predictions and direct observations.
To compare the predictive power of Friedman-Lemaître cosmology (C1) and chronometric cosmology (C2).
To investigate the validity of the quasar evolution hypothesis.

Main Methods:

Analysis of the Large Bright Quasar Sample.
Probabilistic determination of significance levels for deviations.
Comparison of predicted apparent magnitudes and redshift-magnitude slopes with observed data.

Main Results:

Friedman-Lemaître cosmology (C1) predictions deviated by up to 11 sigma from observations.
Chronometric cosmology (C2) predictions showed deviations of less than 2 sigma.
The quasar evolution hypothesis struggled to reconcile C1 deviations with direct observations.

Conclusions:

Significant discrepancies exist between the standard cosmological model (C1) and quasar data.
Chronometric cosmology (C2) offers a better fit to the observed data without adjustable parameters.
The quasar evolution hypothesis appears to be a theoretical artifact, not an observational reality.