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B Number of photons in a given space

  1. Jan 10, 2017 #1
    Because they are massless, could you theoretically fit an infinite number of Photons into a small space? There is probably an equation that proves this wrong but I'm curious.
  2. jcsd
  3. Jan 10, 2017 #2
    Hmm, I do not think so. Photons have energy, and if you stack a sufficiently (VERY) large number of them together into a sufficiently small space, according to physics a black hole should form. EDIT: Actually I'm not really sure about this at the moment, I have to think about it... :biggrin: EDIT 2: I have thought about it, and I think I am correct :smile:.
    Last edited: Jan 10, 2017
  4. Jan 10, 2017 #3
    I think the Pauli exclusion principle says that you can't have two particles having the same state in the same place at the same time,
    Isn't that part of the definition of QM?
  5. Jan 10, 2017 #4
    That's for fermions (they can't have the same state). Photons, however, are bosons. Particles are divided into fermions and bosons, see e.g.
  6. Jan 10, 2017 #5

    Fervent Freyja

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  7. Jan 12, 2017 #6


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    Whether or not an equation says it is possible, it obviously isn't possible in reality to set up a situation where you have an infinite number of photons in a finite amount of space.
  8. Jan 14, 2017 #7


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