Recent content by kfx

Perhaps I could not figure out the right search terms, at least did not see any threads that address the same question as mine, rather than "Can the size of an atom change" etc. It should be quite obvious that I mean no change in time or mass units. In the centimetre–gram–second system, grams...

This is a hypothetical question. What would happen if everything in the Universe was scaled up (or down) in size by a constant factor? Starting from the nuclei in atoms, ending with galaxies; assume that all proportions would be kept intact, i.e. all distances are scaled up by the same factor...

Actually I'm confused. If we're measuring position of a particle, then where do angles come into this? Does it make sense to talk about measuring position in the context of this experiment at all? I think it does. With measuring it, we are reducing uncertainty; not only of the measured...

Dunno, if the observer is stationary with regard to the measurement devices, doesn't that count? You seem to underastand the relativity theory issues better than me, though.

The Kochen-Specker no-go theorem tells that particles cannot be in a definite state "all along", it must be the measurement itself that causes the particle to collapse to a definite state. Read this for a simple introduction why: http://www.cs.auckland.ac.nz/~jas/one/freewill-theorem.html

My guess is that the speed is relative to a static observer. I did post a similar question today. https://www.physicsforums.com/showthread.php?t=445534 Although it got few good replies, I found out that in http://www.nature.com/nature/journal/v454/n7206/full/nature07121.html got it completely...

Yes, a good point. Probably this was obvious to a physicist. :)

If you didn't, then why are you answering to something else? Well, thanks for nothing. I looked at the Nature news and abstract of the actual paper, and they do mention testing all possible frames of reference. The technical side of it is still not clear to me, but doing this actually gives a...

I don't think you understood the question. What does the number 10'000 c refers to?

I was wondering whether it makes sense to talk about "speeds" faster than the speed of light. For example, Wikipedia mentions that the "speed" of quantum entanglement has a minimum lower bound of 10,000 times the speed of light. - http://en.wikipedia.org/wiki/Quantum_entanglement#Concept But...

It is a well known view that mathematical logic together with set theory can be used as a foundation for the whole the rest of mathematics. Category theory also has been mentioned as a candidate for this, as an alternative of set theory. But recently I heard (from a non-mathematician) a view...