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Today, 11:05 AM

Grey replied to a thread what is the maximum angle that an incoming photon's path can be changed by(BH)? in Space/Astronomy Questions and Answers

It can indeed be any angle. If it passes near the photon sphere, it can circle around the black hole multiple times before finally escaping in any...

4 replies | 64 view(s)

Yesterday, 04:40 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

I think that it does manage to contain all the important elements of a typical photon entanglement experiment, while being a little easier to grasp,...

34 replies | 433 view(s)

2019-Feb-20, 09:38 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

As designed, the answer is no. But this is not an essential feature of the analogy (the color of the shoes and whether they match is meant to stand...

34 replies | 433 view(s)

2019-Feb-20, 06:48 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

So, if you look at only cases where they held their boxes differently (so that the odds of a match are only 1 in 6; I think you have that backward,...

34 replies | 433 view(s)

2019-Feb-19, 06:42 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

Thanks! The shoebox analogy here captures, I think, all of the really important features of an actual entangled photon experiment. Those features...

34 replies | 433 view(s)

2019-Feb-19, 02:22 AM

blueshift replied to a thread What do you think of Neil degrasse Tyson? in Small Media at Large

The problem with that pdf file is that it refers to motivation. Is motivation what Tyson is really after? Or, is it funding for science projects that...

120 replies | 4289 view(s)

2019-Feb-18, 11:14 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

Yes, pretty much. We probably wouldn't even have questioned locality if we weren't pretty much force into it. Different from a local model. The...

34 replies | 433 view(s)

2019-Feb-18, 07:01 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

That's correct. In fact, much of the point of the EPR paper was to suggest that quantum theory must be incomplete, with the idea that there must be...

34 replies | 433 view(s)

2019-Feb-18, 05:33 PM

Grey replied to a thread zero dimensional point particle in Space/Astronomy Questions and Answers

An important thing to remember is that a particle's location is in a certain sense tied to its state. In an atom with many electrons, for example,...

16 replies | 507 view(s)

2019-Feb-18, 02:32 PM

Grey started a thread Physics Suppression in Off-Topic Babbling

I just thought today's xkcd was entertaining, in light of the number of folks who come here claiming that they have an amazing theory that would...

3 replies | 126 view(s)

2019-Feb-17, 07:42 PM

gzhpcu replied to a thread if you could connect QM and relativity theortically, could you do it practically? in Science and Technology

What do you mean by "connect"'

3 replies | 105 view(s)

2019-Feb-17, 01:37 PM

Cougar replied to a thread Sorting sources? in Off-Topic Babbling

I recall Leon Lederman's group was involved in that, and he wrote a little about it in his book, The God Particle.... In general, though, the...

1 replies | 62 view(s)

2019-Feb-16, 04:00 PM

Grey replied to a thread Bell's Theorem in Space/Astronomy Questions and Answers

And note that being deterministic is specifically not a requirement for local realism. It's perfectly possible to develop a hypothetical mechanism...

34 replies | 433 view(s)

2019-Feb-16, 11:50 AM

gzhpcu replied to a thread The demise of books in paper form? in Small Media at Large

Just to set the record straight: I have nothing against eBooks. I use them for best sellers at home and when I go on vacation too. From a...

75 replies | 1088 view(s)

2019-Feb-15, 04:12 PM

gzhpcu replied to a thread The demise of books in paper form? in Small Media at Large

http://www.bbc.com/future/story/20160124-are-paper-books-really-disappearing

75 replies | 1088 view(s)

2019-Feb-15, 04:04 PM

gzhpcu replied to a thread The demise of books in paper form? in Small Media at Large

Sorry, you are right. It is my personal opinion. I do have over 400 titles on my Kindle. But they are the read once and throw away bestsellers and...

75 replies | 1088 view(s)

2019-Feb-14, 09:16 PM

Grey replied to a thread The uncertainty principal: measuring things with uncertain instruments. in Space/Astronomy Questions and Answers

The word "theorem" is usually used for proven statements of mathematics (given some particular choice of axioms). This is distinct from the word...

9 replies | 246 view(s)

2019-Feb-14, 08:39 PM

Grey replied to a thread zero dimensional point particle in Space/Astronomy Questions and Answers

I know there has sometimes been at least speculation that leptons, like baryons, could be composed of smaller particles. However, to date there has...

16 replies | 507 view(s)

2019-Feb-14, 04:34 PM

gzhpcu replied to a thread The demise of books in paper form? in Small Media at Large

Well, the situation in Switzerland is different, look at this graph: (even if you do not read German, the green graph speaks for itself.)...

75 replies | 1088 view(s)

2019-Feb-14, 02:11 PM

Cougar replied to a thread The demise of books in paper form? in Small Media at Large

We've got a very cool library here in the Wild West, which I visit a couple times a month. I prefer reading paper books, and Mrs. Cougar likes audio...

75 replies | 1088 view(s)