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pervect replied to the thread I Synchronizing clocks at different locations to measure speed of light.

As I think about the issue more, I h ave to note that my calculations were NOT based on an experimental defintion for energy (or...

Today, 2:00 PM
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pervect replied to the thread I Synchronizing clocks at different locations to measure speed of light.

In the context of my favorite easy-to-understand (though not necessarily most accurate) test of relativity described in "The Ulitmate...

Yesterday, 5:28 PM
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

I like the definition of measuring the energy with a calorimeter - or by the ability to penetrate an armor plate if one has a...

Yesterday, 5:19 PM
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

I'd agree that the momentum is some constant times the (1, beta,0,0), where beta is the normalized coordinante velocity. (in this...

Yesterday, 4:45 PM
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

Well, it looks like I was overcomplicating the analysis. Unless I've made an error (quite possible), [1,0,0,0] and [0,1,0,0] are both...

Thursday, 4:12 AM
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

Just to clarify - this is the geodesic Lagrangian of a free particle, not the relativistic Lagrangian of a free particle, is that...

Wednesday, 7:26 PM
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

Yes, I personally think it would be simpler to introduce relativity by means of proper velocity, or as you write it ##dx/d\tau##. Do...

Sep 28, 2025
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

I'd like to expand on my earlier point. Suppose we have some frame in which Newton's laws work. Two equal masses moving in opposite...

Sep 27, 2025
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pervect replied to the thread I Conventionality of the One-Way Speed of Light.

A cautionary note is needed here I think. High school and introductory physics has been known to be formulated and taught in such a...

Sep 27, 2025
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pervect replied to the thread I Synchronizing clocks in an inertial frame if light is anisotropic.

As long as you don't believe that your clock synchronization has any physical significance, in particular as long as you don't address...

Sep 27, 2025
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pervect replied to the thread B Trying to calculate proper time of worldlines using rotating frames.

If you were to use tensor methods, you would calculate ds from the formula $$ds^2 = g_{\mu\nu} dx^{\mu}dx^{\nu}$$ (So, to get ds, you...

Sep 17, 2025
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pervect replied to the thread I Symmetry of motion in the special theory of relativity.

So far, so good. You have described the symmetry principle of relativity well. And it is indeed puzzling how this is possible - at...

Sep 13, 2025
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pervect replied to the thread I How do Tensors "work" in relation to linear algebraic objects?.

Are you familiar with the concept of dual vectors? I suspect that this may be the underlying issue you are struggling with. Here's the...

Sep 8, 2025
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pervect replied to the thread I Confused about time dilation -- motion vs energy.

As others have pointed out, it's a bit more complicated than that. I'm guessing that you are assuming there is some state of "absolute...

Sep 7, 2025
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pervect replied to the thread I Bloch Sphere generalization for more than one qubit.

I ran across the very interesting https://arxiv.org/abs/quant-ph/0302081, "Geometry of the 3-Qubit State, Entanglement and Division...

Aug 30, 2025

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