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Coherent modes

  1. Jul 29, 2015 #1
    Hi everyone,
    I am reading a paper, which discusses about power spectrum. There is a plot which is power versus k(wave number). It says something about "coherent large scale modes". Would you please tell me what the meaning of this is?
     
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  3. Jul 29, 2015 #2

    Chronos

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    Cite the paper instead of a pinada
     
  4. Aug 5, 2015 #3
    Sorry, I shouldn't have said "a paper". It is a note. I don't know what mode is in regard to power spectrum in fourier space? Does it mean wavenumber? And in addition what "coherent mode" is?
     
  5. Aug 5, 2015 #4

    Drakkith

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    Staff: Mentor

    Again, can you cite the paper you are reading? Perhaps even give us a link to it?
     
  6. Aug 5, 2015 #5

    bapowell

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    They are Fourier modes, which are the time-dependent functions in front of the plane wave basis states in the Fourier decomposition of a function. The mode functions are indexed by comoving wavenumber, k: they describe the time evolution of perturbations on the scale k.
     
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