Friday, March 31, 2023

Extra inertia in an electric field: it cannot be "private"!

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Let us calculate the electric potential of an electron next to a kilogram of hydrogen, assuming that the electrons have been removed from hy...
Tuesday, March 28, 2023

How does pressure create extra inertia?

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UPDATE March 31, 2023: We removed most references to case 1 of the previous blog post. ---- The interaction of the gravity field of a test m...
Saturday, March 25, 2023

Origin and "speed" of extra inertia in an interaction: the field of each particle is "private"

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UPDATE May 3, 2023: Our blog post today shows that the pendulum clocks must have the same inertia regardless of the arrangement. ---- UPDATE...
Tuesday, March 21, 2023

Reza Mansouri (1977): uniformly collapsing perfect fluid ball with pressure has no solution in general relativity

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We wrote a blog entry about this paper on July 13, 2019. Let us again analyze Reza Mansouri's 1977 proof that a uniformly collapsing per...

We can break Birkhoff's theorem with a sphere which "flexes its muscles" - or break the geodesic hypothesis

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In November 2021 we wrote several blog entries about how "tidal" effects can break the metric of general relativity, and Birkhoff...
Sunday, March 19, 2023

The analogy between electromagnetism and general relativity

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UPDATE March 25, 2023: Our claim about a very fast collapse of a shell and Cherenkov radiation is probably false. See our new blog post. ---...
Friday, March 17, 2023

Choosing the coordinate system for a fast neutron star is awkward

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Let a faraway observer see the speed of light inside the neutron star as v << c, where c is the speed of light in the vacuum. Let the ...