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Related Experiment Videos

A lightweight universe?

N A Bahcall1, X Fan

  • 1Princeton University Observatory, Princeton, NJ 08544, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 30, 1998
PubMed
Summary
This summary is machine-generated.

The universe

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Area of Science:

  • Cosmology
  • Astrophysics

Background:

  • The universe's ultimate fate hinges on its total mass-density.
  • Understanding cosmic expansion requires precise density measurements.

Purpose of the Study:

  • To determine if the universe possesses the critical density required to halt its expansion.
  • To investigate whether the universe is destined for perpetual expansion.

Main Methods:

  • Analysis of large-scale structures, specifically galaxy clusters.
  • Utilizing the evolution of cluster number density over time.
  • Cross-validation with independent cosmological measures.

Main Results:

  • Multiple independent measurements consistently indicate a subcritical mass-density.
  • Galaxy clusters and their evolution point to a universe with 20-30% of critical density.
  • The universe's mass-density is insufficient to halt cosmic expansion.

    • Conclusions:

    • The universe is likely 'lightweight' with a subcritical density.
    • The universe's expansion may continue indefinitely.
    • Current data suggests a dynamic, ever-expanding cosmos.