Recent content by mjames

I understand that normally (without entanglement) when either of these cases happens and something disappears "over the horizon" you no longer have any idea of what happened to it. But if you are dealing with one-half of an entangled pair and you still have local access to the other half, why...

My point wasn't that forbidden information was being transmitted. My understanding of these two situations is that you can't know anything about the state of the other side of a event horizon (whether you happen to be inside it or outside it), or anything that's not in your light cone. But...

While there definitely is a special relativity issue at a given constant velocity, my question was more about what the alien would "see" if she was accelerating on the bicycle. It's more of a GR question I think. I know using the word "see" in my original question is imprecise, and I should...

Let's say you have two entangled particles. Is it possible for one of them to fall into the event horizon of a black hole and the particles still be entangled? Or say the two particles are far apart and the universe undergoes extreme expansion (just after the Big Bang, say) such that they are...

The "Illusion of Time" and distant observers In Brian Greene's "Illusion of Time" on NOVA, he cited a case where a distant alien rides a bicycle away from us at a constant speed and then looks back at the earth. She will see a slice of spacetime in our past. Similarly, if she rides towards us...

But isn't it true that there are some things of physical meaning you can say about a system before you observe it? For example, the probability of seeing the system in a given state if you do observe it? I would think that's a very real physical attribute that, for example, you might ultimately...

I'm not sure that's entirely fair. EPR caused quite a stir when it was first proposed among some of the brightest minds in the history of physics. It was these kinds of questions that ultimately resulted in it becoming "perfectly clear". It's true that the general public is several steps...