Recent content by Ian Davis

Since posing the question I would point out the interesting research referenced from: http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser and the project proposed by Cramer at: http://seattlepi.nwsource.com/local/292378_timeguy15.html Ian

Thanks, I will check out the paper.

Thanks.. interesting.. sort of moves the problem to how do photons put on and take off shirts. The analogy also avoids the issue of how do photons which are not in the same time zone (from our perspective -- they probably are from theirs if photons are permitted perspectives) collectively form...

The paper described at http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser rather intrigues me. While the results appear counter intuitive to us, the properties being tested are those of light, and since light travels at speed c, is it not the case that for light time stands still...

A very basic question about Planck length (and time). Are these universal constants like the speed of light which appear the same in all inertial frames of reference, and if so does this mean that someone traveling with very high velocity wrt me will appear from my perspective to have a...

I am not sure if I understand what you mean by emphasising that creation and destruction of bosons, being problematic in the context of time reversal. I'd understand bosons to be absorbed and emitted (converted to/from energy absorbed emitted by the fermion of the correct type), but I don't see...

I date reality from 1963 when at age 10 when I saw the very first episode of Dr Who. My sister who was only 7 at the time meanwhile remembers the same date somewhat less enthusiastically as the date when her desire to watch Emerald Soup were thwarted. We both have long memories...

The bottom clock is skewed with respect to the fixed clock just as are the distances. The clocks that change are essentially the computed clock times for that position in space-time given that the ruler is moving at the indicated velocity with respect to the stationary observer. It might...

True, but I find just as intriguing the question as to which way that same pulse of light is traveling within the constructed medium. The explanation that somehow the tail of the signal contains all the necessary information to construct the resulting complex wave observed, and the coincidence...

I read a science fiction story as a child, that once read was never forgotten. It was about a government conspiracy to create the appearance that a brilliant but ficticious scientist had created an anti-gravity device only to die before he could get his results to print. The government...

Your example here is an interesting one in the case of Bell's theorem, because it demonstrates the way that assumptions can slide into ones thinking processes, and so cloud the truth of the matter before one. I personally would love to know whether a 30 light year distance, 40 light year...

True enough. At the theoretical level I agree, but any practical application of the theory has to take the distance to be traveled and the time dilation into consideration, once relative velocities make the time dilation significant. Purely mundane issues such as lifetime of componentry...

Very educational.. thanks a million. But the numbers seem a little contrived because at no point do the two observers at their respective 0.0m mark agree on times or distances except at time t=0. Consider A to be stationary. Then when A believes time=1 microsecond in A's context B...

The possibility that quantum waves can travel backwards is being explored by: http://faculty.washington.edu/jcramer/NLS/NL_signal.htm It is also possible that light can be persuaded to travel backwards in time. The light peak shown in the following video, exits some distance from where it...

Not all proofs hinge upon negative reasoning, and there are a class of mathematicians who dispute the law of the excluded middle: That is that something must be true or false and that a proof of not false is a-priori equivalent to a proof of true. This class of mathematicians argues that only...