Schwarzschild radius of the Universe

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The discussion centers on the concept of the Schwarzschild radius and its relation to the observable universe, based on the equation Rg = 2GM/c². It is noted that if the mass of the universe is plugged into this equation, the resulting radius aligns closely with the observable universe's size, although this is not entirely accurate and varies over time. The conversation critiques Michio Kaku's assertion that the universe resembles a black hole, emphasizing that the universe's geometry and black hole spacetimes are fundamentally different. Additionally, the role of dark energy in the universe's expansion is debated, with some participants questioning whether the total energy of the universe is increasing as dark energy density remains constant. Ultimately, the relationship between the Schwarzschild radius and the universe's size is acknowledged as more than mere coincidence, reflecting deeper gravitational principles in 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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