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pervect's latest activity
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pervect
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Do observers always agree on the number of waves in a beam of light?
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It is not surprising that you use non-standard terminology, but its imprecision can cause some confusion. I'm going to use the...
Apr 14, 2024
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pervect
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New Paradox Discovered, I Think
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You already noted that the light is faster than the ship. Thus, the light should reach the Earth first, followed by the ship. This...
Mar 28, 2024
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Is momentum conserved as a body falls through a gravitational field?
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Momentum in GR is complicated, as is energy in GR. There are several concepts of energy, and momentum, in GR, not just one, that can be...
Mar 22, 2024
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pervect
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Spacetime expansion - time dimension expansion
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Einstein has used the idea of "shrinking" or "expanding" rulers in his popularization, "Relativity: The Special and General theory"...
Mar 15, 2024
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pervect
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Teaching Minkowski diagrams effectively
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Possibly. My main thought is that the approach (which is of course your approach) in "Relativity on Rotated Graph paper" is a promising...
Mar 11, 2024
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pervect
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Teaching Minkowski diagrams effectively
in
Special and General Relativity
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I've felt for some time that a primer on space-time diagrams and light clocks would be very helpful, but I was (and am) too lazy to do...
Mar 10, 2024
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pervect
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Hornbein's post
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What do people mean when they say “space is flat?”
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It means that if you send out two parallel laser beams through empty space they will stay parallel forever. They won't converge or...
Mar 9, 2024
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pervect
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General Relativity and Universal Gravitational Constant
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I'm not sure I understand your point. What specific geometric entity (tensor, scalar) is "path curvature" supposed to represent in this...
Mar 1, 2024
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pervect
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General Relativity and Universal Gravitational Constant
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It's fairly easy to say that curvature can be related to relative acceleration between nearby geodesics per unit distance between said...
Feb 29, 2024
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pervect
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General Relativity and Universal Gravitational Constant
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I'd like to "upvote" A.T.'s observation, force / unit mass is the same thing as acceleration. This illustrates that forces don't really...
Feb 29, 2024
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pervect
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General Relativity and Universal Gravitational Constant
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Even in Newtonian Mechanics you can define G without mentioning a "force", based on the acceleration of a falling test mass. Those...
Feb 29, 2024
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pervect
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Dale's post
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General Relativity and Universal Gravitational Constant
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Although they are not acceptable sources for answers we usually permit them as sources for questions, as the OP did here. It is...
Feb 29, 2024
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pervect
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Question about "odometer" analogy and time dilation
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This is a valid (and IMO good) way of looking at things, but a reference to your source would be helpful to settle any fine details...
Feb 28, 2024
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pervect
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How to add an object's multiple relativistic speeds from x, y, and z?
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When you reach 99 percent of the speed of light in one direction (we'll call it the x direction), you'll have some momentum in the x...
Feb 25, 2024
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pervect
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Is the electromagnetic 4-vector indeed a 4-vector?
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Also of potential interest is the Aharonov-Bohm effect, https://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect.
Feb 25, 2024
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