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About the wavefunction

  1. Mar 25, 2012 #1
    What is the physical basis for the requirement that the wave function has finite and continuous first order derivative?
     
  2. jcsd
  3. Mar 25, 2012 #2

    tom.stoer

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    b/c only then it carries finite momentum and energy in a finite interval

    [tex]\int_{x-\epsilon}^{x+\epsilon}dy\,\psi^\ast\,(i\partial_y)\,\psi[/tex]

    [tex]\int_{x-\epsilon}^{x+\epsilon}dy\,\psi^\ast\,(-\partial^2_y)\,\psi[/tex]
     
  4. Mar 26, 2012 #3
    Thank you.That really helped me a lot.
     
  5. Mar 26, 2012 #4
    Why don't we feel the rotation of the earth when we observe it from a helicopter?
     
  6. Mar 26, 2012 #5
    Has "D-WAVE Systems" really developed a quantum computer?
     
  7. Mar 26, 2012 #6
    Is there any branch of physics that deals with the neural networks in the brain?
     
  8. Mar 26, 2012 #7
    i was thinking about light.
    a particle and/or a wave ?
    but what about darkness.?
    does darkness move at the speed of light?
    does light move at the speed of darkness?
    does light really bend around corners or is it pulled around by darkness?
    in a dark universe, does the universe expand when light appears?
    does light "push" darkness away ?

    your thoughts
     
  9. Mar 27, 2012 #8
    Darkness is nothing but the absence of light.
    One can definitely say that speed of darkness is equal to the speed of darkness as when light travels the darkness vanishes away.
    Light pushes the darkness and darkness has zero resistance in stopping the light.
    I guess that the expansion of universe has nothing to do with the light as it is expanding because of the bodies that are travelling.
     
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