Schwarzschild radius of the Universe

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SUMMARY

The Schwarzschild radius, defined by the equation Rg = 2GM/c², can be applied to the total mass of the observable universe, yielding a radius that corresponds to the extent of the universe we can observe. This calculation, while intriguing, does not imply that the universe possesses a true Schwarzschild geometry, as it is fundamentally different from black hole spacetimes. The relationship between the Schwarzschild radius and the observable universe's radius is not merely coincidental; it arises from the natural length scale of gravitational phenomena. However, the implications of dark energy and its constant density complicate the understanding of the universe's total energy.

PREREQUISITES
  • Understanding of General Relativity (GR) principles
  • Familiarity with the Schwarzschild solution in GR
  • Knowledge of cosmological models, specifically FLRW spacetimes
  • Basic grasp of dark energy and its implications in cosmology
NEXT STEPS
  • Study the Schwarzschild solution in General Relativity
  • Explore FLRW cosmological models and their significance
  • Investigate the role of dark energy in the universe's expansion
  • Learn about gravitational phenomena and natural length scales in GR
USEFUL FOR

Astronomers, physicists, cosmologists, and anyone interested in the fundamental properties of the universe and the implications of General Relativity.

  • #31
Ivan Seeking said:
https://www.msn.com/en-us/news/tech...pc=U531&cvid=272cb184de9c48fbbd3b321120e37dac
This article is not at all reliable. At one point it says the radius of the entire universe (not observable, entire) is 23 trillion light years across, but at another point it says our universe is open, which means it would be spatially infinite. (Our actual best current model says our universe is spatially flat, which is different from both.)

At another point it says that SR says "time stops" at the speed of light, which is a common pop science misstatement.

The article references no actual scientific papers, just other pop science sources.

In short: this article is not a valid basis for PF discussion. The main claim made in the OP has been refuted. This thread is closed.
 
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