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This is an area rife with potential misunderstanding, so we need to be absolutely clear what we mean. Suppose I take a ruler and a clock and I use rulers to mark out $x, y, z$ axes in space and the clock to note the positions of events in time. Assuming spacetime is flat, I now have a universal coordinate frame that everyone who is stationary relative to me ...


0

In the original paradox, there are two events of note: the front of the train exits the tunnel, and the rear of the train enters the tunnel. Call these events A and B, respectively. Because these two events are spacelike separated, the two observers (tunnel-based and train-based can disagree on the order in which they occurred. According to the tunnel ...


3

There is a mathematical point that can be made, and in my opinion is related to a deeper understanding of what it means to solve a (partial) differential equation. I will try to keep things simple, and consider only linear models. Suppose that you have a space $X$ with some properties, for example it has a topology. We suppose that the state of our system ...


0

I could give a shorter then the other answers because of a different understanding how a double slit works. See my questions and answers in this forum. Every photon with its E and B field components get into interaction with the surface electrons from the slits material. Their field is quantized and this we see as fringes. Diffraction we not only get behind ...


2

Will the pattern the 1 million entangled photons (An) created on the right screen in case 1), be discernible from the pattern in case 2), in the sense of being able to state with high probability which of the 2 cases applies, by analyzing the distribution of the photons (An), which hit the screen after passing through the right slit? No, the pattern of the ...


4

Your question is muddled and unclear (in my professional opinion - you may think otherwise and that's OK), but I think I can make one thing clearer. If you have two entangled systems, $A$ and $B$, and perform independent experiments on either side, then nothing about the choice of experiment you perform on $B$ will have any effect on the local results from ...


1

I've been playing around with a concept for this for a while now. I call it Paradox Shadow. One-way FTL would be a subset of this, and I think you're correct that it should work without causing time travel. FTL violates causality due to relativistic time dilation. In other words - FTL would be fine if everything in the universe was at rest to everything ...



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