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physics.hist-ph2019
A Spherical Version of Feynman's Static Field Momentum Example
Oliver Davis Johns
The Feynman demonstration that electromagnetic field momentum is real-even for static fields-can be made more pedagogically useful by simplifying its geometry. Instead of Feynman's…
physics.hist-ph2019
Leibniz Equivalence, Newton Equivalence, and Substantivalism
Oliver Davis Johns
Active diffeomorphisms map a differentiable manifold to itself. They transform manifold points and objects without changing the system of local coordinates used to represent those…
physics.hist-ph2019★ 8 cited
Validity of the Einstein Hole Argument
Oliver Davis Johns
Arguing from his "hole" thought experiment, Einstein became convinced that, in cases in which the energy-momentum-tensor source vanishes in a spacetime hole, a solution to his gene…