pervect's latest activity

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

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...

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...

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

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

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...

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

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...

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...

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