PeterDonis's latest activity

I think earlier it is mentioned that tidal gravity, the actual manifestation of curvature, is not fictitious. GW would similarly not be...

One could interpret this as saying that the theory might have to make use of unobservable quantities, but it will predict what we will...

Sounds like typical Einstein, like when someone asked him what he would have done if experiments had not confirmed the predictions of...

The only known solution I'm aware of that is geodesically incomplete but has no event horizon, only an apparent horizon (trapped...

In general, one can think of the curvature at any point in spacetime as being caused by something in the past light cone of that point...

No.

No. Yes, we do. "Infalling mass" is a specific region of spacetime, occupied by nonzero stress-energy. A portion of that region is...

Yes. Even if the stress-energy of the infalling mass doesn't disappear (if, for example, it all came out eventually as Hawking...

The estimated mass of Sagittarius A is only a few million solar masses. Some quasars are believed to have black holes of a billion solar...

I'm not sure I would expect it to, because the trajectory it's following is so far from the Moon, as compared with the Apollo missions...

I think it's the other way around. Assuming a wave function amounts to assuming a particular Hilbert space (the space of square...

The criterion for "sufficiently advanced" is, at the very least, "legally granted person status". Until then, some person (or...

Yes, I know. But the fact that it's a possibility at all is enough for this discussion. Depends on your definition of "sufficiently...

Not until and unless AI those autonomous AIs are first granted the status of person and can be held legally, morally and physically*...

Why not? If I create a monster and let it loose, and it causes harm, how does saying "it's autonomous" get me off the hook? The...