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Hypothetical situation in which, for simplification, only some physical aspects are considered in order to further understand or reveal contradictions between the laws governing them.

4 votes

Symmetry in the Simultaneity of events in Special Relativity

To supplement the answer by @SolubleFish , it might be helpful to interpret "simultaneity" geometrically, in terms of the tangent line to a circle ("the curve of constant square-interval"). In Euclide …
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38 votes
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Why is the photon clock equivalent to all clocks?

Invoke the principle of relativity. An inertial observer carries both a light clock and a mechanical wristwatch, which agree when all are at rest. If they don't agree when the inertial observer is mov …
robphy's user avatar
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