PeterDonis's latest activity

Extremal doesn't always mean maximal. An example is a free-fall geodesic orbit around a planet; its proper time is extremal but not...

Theorems 9.4.2 and 9.4.3 in Wald prove this, the first for the family of curves between fixed points ##p## and ##q##, the second for the...

I just looked up the theorem in Wald to see how it is explicitly stated. Theorem 9.5.1 states a maximum length to the past of the given...

First, even if this happened, you would still have incomplete geodesics. So it wouldn't change the conclusion that incomplete geodesics...

After moderator review, the thread will remain closed.

The correlations associated with "thermal nonlocality" can't violate the Bell inequalities, so no, I would not say they're "similar...

If you use the restrictive definition of "planet" by which Pluto got demoted to, IIRC, a "dwarf planet" (and the others further out are...

These are two different questions. "Moving in a specific direction" is a question about momentum. Photons do have a well-defined...

Is it? That's the question. The fact that you can write down a force equation with a damping term, so that mechanical energy is not...

Lack of global conservation of what? In FLRW spacetime, the issue is not that there is a global invariant that is not conserved. The...

Actually, "conventional physics" does have a concept something like what you describe--indeed, that's how the concept of a "field" arose...

This is personal speculation and is off limits here.

That's correct. It's a consequence of the Einstein Field Equation, plus including all forms of local stress-energy in your model. In a...

What are these "things"? The quantum states in QFT are of the field. So, I don't understand what is meant by quantum states generated...

Only if you think correlations that violate the Bell inequalities is of no concern. Which is certainly a possible point of view, but it...