PAllen's latest activity

For a true point particle, there would be no limit, of this kind at least. Note the post begins: as soon as you give a particle finite size.

Yes.

No, it implies that there is an upper limit to energy in circular accelerator that is way beyond what has ever been achieved on...

@pervect , I have come to agree with you. My prior post was looking at something like some generalization of spring behavior, where work...

I am away for the weekend. If I don’t forget in a few days, I can post a really simple continuum disc model in terms of the simplest SET...

Also, as soon as you give a particle a finite size rather treating as a mass point, there is fundamental difference between circular...

Actually, I think the radial tension must be related to a potential energy contribution to the T00 term, forced by zero divergence...

@pervect, thanks! I was having a similar thought that to make a spun up disc be valid in the sense of local conservation of momentum...

Well I can think of a recipe for building one:wink: Just start accumulating cold iron filings in one place, continue till you’ve added...

Metric theories of gravity all obey all but the strongest form of equivalence principle. So, no Newton-Cartan theory could not...

Elevator on the surface of earth is not inertial because the surface of the earth is exerting a real force on the bottom of the...

Kind of going back to the original question. To understand why gravity is considered a fictitious force ( I prefer the term inertial...

I should add that there are different versions of the equivalence principle. For something called the strong equivalence principle...

On the other hand, a particle model is, itself, an approximation. If you believe QFT, there are only continuous fields at the root. And...

I want to add a few more observations about this topic. I think the key point is that there is nothing wrong or paradoxical about the OP...