PeterDonis's latest activity

Hit pieces like that are generally considered harmful when humans write them. A human can't dodge that responsibility by pawning the...

Whoever put the AI agent into operation. This is standard legal theory. This would be the "human of record" in the terminology you describe.

Not misleading, just wrong. You are correct that if the universe is closed and finite then it always was; if it is flat or open and...

In which case I don't see its relevance to what we're discussing in this thread. Of course it does. All tensors live in the tangent...

Again I'm not sure what you mean. The tangent space at each point of a smooth manifold is a vector space, and that is the vector space...

I don't see why you need "this construction" to do that. All you're doing is taking a linear combination of tensor fields in the tangent...

Then you have many possible PF threads. "Many questions" is way, way too broad for a single PF thread. Pick one particular question you...

@Shugart do you have an actual question? A laundry list of papers and a bunch of underlined items is not a good basis for a PF thread...

I'm not sure what you mean by this. It doesn't seem to be the same as what Wald is saying. I'm not sure what this means either. The...

I had to look it up as well. :wink: Wald, Section 9.2, does use the term "projection operator" in the phrase: "projection operator onto...

Only with a very...nuanced...meaning to the word "complete". :wink: I think a better way to describe it would be that Bohr and other...

Yes, you can, if you like, define a 4-d tensor that is guaranteed to be transverse in the sense given. But that 4-d tensor is not "the...

First, just the title of the video screams "not a good source". Second, it's not clear that the video actually is Feynman. Third...

The hypersurfaces are 3-dimensional; therefore, any projection onto them must also be 3-dimensional.

Metrics are symmetrical. TT gauge can only be obtained outside the sources. The 8 conditions are$$\partial^\mu h_{\mu\nu} =0 \quad...