PeterDonis's latest activity

Nothing that I said depends on the material model. The details of exactly what stresses will be present for an object described by a...

But it doesn't seem to me that there is any preferred basis of configurations. Surely, Barandes formulation doesn't stop you from...

Here, I'll even give a simple example for you to address the issue with. I build a rod in flat spacetime, in free fall. It has proper...

It's not an argument, it's a definition of what proper acceleration is and what it means physically. You can't say that all of the...

As I said, every QM interpretation has features that are unpalatable. It's just a question of what kinds of unpalatability you prefer to...

Not quite. It's true that "deterministic, but with epistemic uncertainty" forces you to accept something like the Bohmian...

But there are QM interpretations where the results are epistemic and the assumptions you refer to are violated. For example, the Bohmian...

You still haven't shown the math of how you pick these out from other stresses. And, as I pointed out in a post some time ago, and...

No, this is not correct. If you apply external forces to each part of the object sufficient to account for the proper acceleration of...

I think their claim is more limited than that. De Sitter spacetime has a timelike KVF, and a Killing motion using that KVF can certainly...

Ah, ok. I don't think that's what @Ibix was describing: he was describing setting up a static network of rockets in Schwarzschild...

Which congruence are you referring to? The one that describes moving the structure from flat spacetime to curved spacetime?

Ah, got it, thanks! The key point is that the form given by Moller (1952) explicitly shows that the orthogonal spatial slices are flat...

Wouldn't this violate the H-N theorem if it were true?

If the proper acceleration of each worldline is not constant, the congruence is not stationary.