pervect's latest activity

The two formal defintions of born rigidity I'm aware of apply to timelike congruence which I will denote as ##u^a##. I believe the...

I don't understand the reference to "trying to turn into a torus", but I did find references (and also had vague recollections that I...

Do you have a reference? I was unable to confirm, though I did run into some interesting reading about bar mode instabilities for a...

To understand the rotating disk in special relativity, I believe you need some background material that is not high school level. The...

That's a good comment, it might be worth mentioning a list of commonly used coordinate time standards besides cosmological time. The...

Some recent threads inspired me to want to make a list of the different notions of time we need in physics (As I write this, I am...

The organizational structure in MTW actually illustrates why there are 20 degrees of freedom and 21 unique (up to sign) nonzero...

I was doing some more reading, and apparently the "modern" approach to the topic involves decomposing the Weyl tensor rather than the...

It seems to me you are asking, at least in in part, about the self-force problem. "How does a particle, the thing that you are calling...

There is a way to break down, or decompose, the curvature tensor in General relativity (called the Riemann tensor) into parts, which can...

If you do an experiment in a small sealed box where you only look at things inside the box, the laws of physics according to special...

I'm on board with this - I regard it as the theory of timelike congruences, which I first stumbled across in Wald, and later read more...

I have espoused that idea, and met a lot of resistance in certain instances. When I have the energy, I still do sometimes like to...

I would use much simpler (but also less precise) language to convey a similar thought. I would call "causal diamonds", light clocks...