This article is taken from the journal Les Indispensables de Sciences et Avenir n°209 dated April/June 2022.
General relativity posits that the curvature that prevails at a point in space-time—think of the deformation of the mattress by the weight of a Petenck ball—is proportional to the density of matter and energy that is there (since by virtue of ) the equation E = mc², matter and energy are two sides of the same thing and to weigh So both). So general relativity is roughly written as: “curvature = mass-energy something multiplied by density”.
A funny article, very short, published by Erwin Schrödinger
In 1917, Albert Einstein revised his theory by introducing the “cosmological constant”. This constant, in his mind, was an intrinsic curvature of space—so it was on the left side of the equation—that would allow him to counteract the gravitational pull exerted by matter and the energy within it. Einstein wrongly expected to obtain the stable and eternal universe that everyone believed in at the time – even though it was soon discovered that the effect of is probably an acceleration over a long period of expansion. Curiously, the following year, one of the fathers of quantum mechanics, Erwin Schrödinger, published a funny article, Very Short, where he explained that we could pass to the other side of the equal sign. An exercise in early arithmetic, but whose importance Einstein immediately understood: initially in favor of effects, passed in favor of causes.
To understand, imagine a piston in a vacuum.
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