PeterDonis's latest activity

They are mathematical abstractions that rely on the fact that, locally, the sphere looks flat (the effects of its curvature get smaller...

No, they aren't. Tangent spaces do not rely on any embedding. People often visualize tangent spaces using such an embedding, but that's...

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...

Robert Leighton was a physicist and coauthor of the Feynman lectures. His son Ralph Leighton was not, nor did he ever claim to be...

Still a lot, and I'm not sure where it's all coming from or why you're asking about it. Some references would be helpful. If your main...

You said a lot in post #30. What particular point or points are you asking about?

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

What does "completely different" even mean? And why do you care? Who is even making this claim? And again, why do you care? Okay...

You seem to think that being a "fundamental particle" is somehow different from being a quantum field. It isn't. The only theoretical...

None. The electron is a fundamental particle in our best current theoretical models. (But "particle" is just shorthand for "quantum...

You have been victimized by pop-sci misdescriptions. The entire notion of “wave-particle duality” was abandoned as a false start almost...

I also agree. To call what you get with a homogenous but anisotropic two way speed a "simultaneity plane" you need to require that...

The velocity limit won't be, but you won't be able to integrate over p2's worldline past a certain point, because, as has been pointed...

You might want to, as it makes it possible to prove that a message came from you. Say you want to make a public proclamation that is...

Try this: I send you a box and a padlock that's currently open. I have the key to the padlock, but no one else does. You put your...