Recent content by DaveBeal

Thanks for your response, Peter. You say that, after the measurement, your second (entangled) wave function applies in both branches. So say you're in the branch where the electron just measured spin-up. If the entangled wave function holds and you immediately measure again, there will be a...

In Sean Carroll's book The Biggest Ideas In The Universe: Quanta And Fields he gives a very brief description of Everette's Many Worlds interpretation (page 73). I think he's saying that in this interpretation, when you perform a measurement on a quantum system, the universe splits into...

Is it theoretically possible for the expansion of the universe to red-shift the energy of a photon all the way to zero? If so, what happens to the photon? Or does the photon's energy only approach zero as an asymptote?