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### Single Idea 21104

#### [catalogued under 27. Natural Reality / B. Modern Physics / 1. Relativity / b. General relativity]

Full Idea

The left-hand side of the general relativity equations descrbe the curvature of the universe, and the strength of gravitational forces acting on matter and radiation. The right-hand sides reflect the total density of all kinds of energy and matter.

Gist of Idea

General Relativity: the density of energy and matter determines curvature and gravity

Source

Lawrence M. Krauss (A Universe from Nothing [2012], 04)

A Reaction

I had assumed that the equations just described the geometry. In fact the matter determines the nature of the universe in which it exists. Presumably only things with mass get a vote.

Book Reference

Krauss,Lawrence M.: 'A Universe from Nothing' [Simon and Schuster 2012], p.57