Recent content by unusualname

  1. U

    I Why no position operator for photon?

    Er, you make it relativistically correct by redefining what you mean by the Hamiltonian Evolution operator - the Schrodinger Equation is a postulate of quantum mechanics for a reason. Just because people haven't worked out the correct evolution operator doesn't mean it's not possible to get...
  2. U

    Are photons the antiparticle of itself?

    Yeah, but only at energies so their constitute fermions aren't relevant - a composite boson can not break the exclusion principle for its constituents!
  3. U

    Long-term room-temp quantum entanglement achieved

    (No post on this, so fyi in case you missed it) Scientists have established a room-temperature quantum state for ~39 minutes, smashing the previous record and easily beating evolution (as far as we know) They managed it a bit earlier than my prediction of ~2015, so I expect faster than...
  4. U

    ’t Hooft on the Foundations of Superstring Theory

    The problem is, what stops the universe happening "all at once"? With a deterministic CA you have to make an additional assumption that each iteration takes some finite time-step. (Wolfram's computational speed limit of the universe idea) Whereas if you have spontaneous "jumps" seeding each...
  5. U

    ’t Hooft on the Foundations of Superstring Theory

    Suppose you have a single particle (with no internal structure) in the entire universe. What would it do? You'd probably say nothing, but let's describe it by exp(ix), where x is real, and allow x to spontaneously change (otherwise nothing ever happens) We could perhaps just describe it by x...
  6. U

    Bohm trajectories and protective measurements?

    edit, to be more precise, it does not matter that |Psi|^2 is invariant in time (globally)
  7. U

    Bohm trajectories and protective measurements?

    Sorry I deleted an incorrect comment, what I meant to say was that it does not matter that the probability distribution GLOBALLY is invariant in time, in fact this would be expected otherwise the entire universe might flip into some unnatural state every 10^-43 secs. You only see this as a...
  8. U

    Bohm trajectories and protective measurements?

    Of course the problem only exists if we are sure the Hamiltonian of the Universe is zero. The zeroness relies on General Relativity being completely correct in its application to Cosmological models. But General relativity will almost certainly be replaced by a more correct theory when Quantum...
  9. U

    Does particle spin depend on background?

    post #8 was the best post in the thread
  10. U

    Does particle spin depend on background?

    OK friend, No one understands how the quantum mechanical property of "spin" truly relates to reality, its background or whatever. My Answer: Just suppose the QM background IS the evolution equation (and everything)
  11. U

    Does particle spin depend on background?

    eh? (I don't know latin) no, spin exists cos of all the complex (universe wide) linear algebraic evolution going on every 10^-43 secs or whatever
  12. U

    Does particle spin depend on background?

    Yeah, I wouldn't bother with continuous multi-dimensional geometry models, they're the epicycles of our age, maybe good for approximate modeling in simplistic situations but otherwise not reality. Reality = linear algebra + probability
  13. U

    Does particle spin depend on background?

    Yes sorry, your reply contained cool and relevant info which i didn't mean to dismiss :-)
  14. U

    Does particle spin depend on background?

    Hi Tom, except Spin isn't a relativistic property - look at Levy-Leblond's paper (see my post above, sorry we posted simultaneously) - you just need a multi component wave function to incorporate spin.
  15. U

    Does particle spin depend on background?

    Hi friend, spin is just an extra degree of freedom introduced when you realize the "wavefunction"/"state-vector" of a particle requires more than one complex component to describe it, Levy-Leblond's famous 1967 paper (free download) explained this (so, in particular, Dirac's relativistic...
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