Saturday, May 10, 2025

The doomsday argument

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The doomsday argument was popularized in the 1980s by the astrophysicist Brandon Carter, a colleague of Stephen Hawking. https://en.wikiped...
Thursday, April 24, 2025

John Bell's inequality: did John von Neumann derive it in 1932? No

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John von Neumann's 1932 book about the foundations of quantum mechanics contains a proof, which, according to von Neumann, shows that qu...
Friday, April 18, 2025

Chyba, Hand, Hossenfelder and generating electricity from a stationary magnetic field? It does not work

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Sabine Hossenfelder (2025) is advertising a strange invention, almost a perpetuum mobile, which is supposed to stand static relative to the ...
Thursday, March 27, 2025

Retardation of clocks from acceleration in a collapsing dust ball

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Let us try to estimate the effect of clock retardation in a collapsing dust ball, or in an expanding universe, if retardation is based on th...
Saturday, March 15, 2025

Retarded slowing down of clocks in a collapse

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Let us continue our analysis of the assumption that a clock cannot "know" faster than light how it should tick. It can only receiv...
Tuesday, March 4, 2025

How is energy conserved in the collapse of a dust ball?

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Let us look at the collapse of a uniform "dust" ball. Besides dust particles, the ball may contain photons, or other elementary pa...
Thursday, February 27, 2025

Dark energy comes from bouncing gravitational waves of galaxy groups?

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Suppose that we have individual electric charges placed roughly into a configuration of a spherical shell of a radius R. The number of charg...