Recent content by Matterwave

There is no "hidden variable" in MWI, it is not a hidden (or extra) variable theory. All there is is Schroedinger evolution of the (universal) wave function / state vector. You could try to make an argument that MWI (and standard QM in general) is incomplete, a-la EPR, but that's a different...

Ah gotcha. I don't know this field that well, I was simply parroting back the article:

https://www.edmundoptics.com/knowledge-center/application-notes/lasers/gaussian-beam-propagation/?hl=en-US I am no expert in laser technology, but I found the above article helpful! A laser in a vacuum (I'm thinking here, laser light traveling in a vacuum) does not lose energy since there's...

We would generally regard QFT as only an effective field theory that approximates some deeper theory as well. QFT still suffers from a whole host of issues -- there's a millennium prize problem just to put one type of QFT on solid mathematical footing.

Although I agree with the general gist of statements made in this post (my read: decoherence drives branching, we don't branch off of every quantum d.o.f.), I think saying there's just *two* branches for Schrodinger's cat is oversimplifying things. Decoherence is not a sharp line. You still have...

I feel he had a nice idea -- gravity causes collapse. He put out some heuristics on how to look for it. The experimental community (based on that last paper) went and took a look but didn't find the effects and rules out the most naive, parameter-free version of the theory. This is healthy...

Fwiw, Sean Carroll, a quite strong proponent of MWI, says that "the probability problem" (all outcomes happen, so what do we really mean when we assign a probability to a particular one?) is a major problem worth investigating in MWI. Based on what I've seen of his interactions with...

Nice, it looks like they are attempting to test the theory. But it does seem like maybe the most simple version of the theory has been ruled out experimentally. See attached image from the Arxiv paper. Just my personal opinion (and I give it here only because OP explicitly asked for "the...

There are also objective collapse theories (GRW, Penrose gravity-collapse) where the wave function collapse happens at dynamical timescales not related to measurement. But getting back at the OPs original question. I think Peter's post is a good tornado-speed summary of the interpretational...

I'm only an hour and a half in haha, and no, there's not been any discussion about entanglement. The only mention I've heard so far that comes close to discussing that was that it was claimed by David Albert that the definition of "local" vs "non-local" used by Barandes is sufficiently...

New Robinson Podcast -- David Albert w/ Jacob Barandes. David gives his version of the theory in the first segment. I haven't watched the whole thing yet.

If the "second derivative is (just) enough to detect it" then it means you are measuring curvature. :) The geodesic deviation equation (in abstract index notation): ##u^b\nabla_b (u^a\nabla_a \xi^c) = R^c_{\: abd}u^a u^b \xi^d## explicitly includes the Riemann tensor in it. It shows, this is a...

Just to understand your question better, when you bring in "extended body" here, are you envisioning that the body is large enough that one side of the body "feels more gravity" than the other? (Because it's closer to the gravitating object)

Well for me it makes it a bit harder :P But also fair, that's my gap, I should not have implied it for everyone. Thanks for the references~ another place for me to look into! :D

That's fair, and I could definitely be on board with teaching a coordinate independent view as a first-class principle. It does make talking about fictitious forces a bit difficult though. And TBH I have not seen a rigorous treatment of something like coriolis forces or centrifugal forces in...