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Physically, what do positive frequency modes represent?

  1. Oct 16, 2012 #1
    I know this is a basic question, but why are positive frequency modes so important when expanding a field operator. Furthermore, what do they represent?
     
  2. jcsd
  3. Oct 18, 2012 #2

    Demystifier

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    A mode with a positive (negative) frequency corresponds to a particle with positive (negative) energy. Obviously, in nature we only see particles with positive energy.
     
  4. Oct 18, 2012 #3

    Bill_K

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    A positive frequency mode of a field operator represents the creation of a positive energy particle. A negative frequency mode of a field operator represents the annihilation of a positive energy antiparticle.
     
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