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A photon with spin 2?

  1. May 11, 2010 #1
    Dear all,

    Can you please enlighten me about the spin of photons?

    How can you tell if it is spin 1 or 2 ?

  2. jcsd
  3. May 11, 2010 #2
    1 since it transforms as a vector under lorentz transformations (or rather the four potential transforms as a vector)
  4. May 11, 2010 #3
    Dear ansgar,

    Can you explain the detection and nature of the four potential?

    "it" is the "four potential" that transforms as vector under Lorentz transformations?

    The spin is 1 because the vector is a tensor of order 1?

  5. May 11, 2010 #4
    yes vector = tensor rank 1


    Use google mate
  6. May 11, 2010 #5
    Dear ansgar,

    Thank you for your reply.

    What kind of tensor of rank 2 can you expect after a Lorentz transformation?

    Is the "four-potential" enough to describe the signals detected?

    cheers mate,
  7. May 11, 2010 #6
    Assuming by "the signals" you mean the electric and magnetic fields, then it's more than enough (gauge freedom).
  8. May 11, 2010 #7
    Dear sheaf,

    Thank you for your kind reply.
    So the "four-potential" detects electric and magnetic fields.
    The matrix consider the electric and magnetic fields has independent signals?
    Is the magnetic field independent of the magnetic field?

  9. May 11, 2010 #8
    you mean

    Is the ELECTRIC field independent of the magnetic field?

    no you can see that from the very definition of E and B ...
  10. May 11, 2010 #9
    Dear ansgar,

    yes, I meant: Is the electric field independent of the magnetic field?
    thank you!

    cheers mate,
  11. May 11, 2010 #10

    Vanadium 50

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    Afcarval, what's your background in physics. I get the impression that these answers aren't pitched at the level you're expecting.
  12. May 11, 2010 #11
    Dear Vanadium 50,

    In my degree I had some physics, in my master too and in my PhD also... but not specific in physics. Only a course in Quantum Monte Carlo...

    I had no expection about this forum pitch.

    My basic question: can you detect one photon with spin 2? Why?

  13. May 11, 2010 #12
    there is no such thing so how can you detect it?
  14. May 11, 2010 #13
    Dear ansgar,

    So you are telling me that by definition is not a photon?

    But can you model the response in order to have a photon with spin 2?

    Another way to put the question. Can you have a particule with spin 2 without electromagnetic perturbation?


  15. May 11, 2010 #14
    you can detect photons with a combined angular momentum and spin and parity as you want, that is just the multipole expansion..
  16. May 11, 2010 #15
    Dear ansgar,

    Can you explain better?

    You are telling me that: if you want, you can detect a spin 2 for photons?

  17. May 11, 2010 #16
    you have not defined properly what you mean with all of this. photons can have angular momentum J which is the sum of L and S

    I can not explain better since what you really need is to define what and why you are asking this for and a couple of textbooks
  18. May 11, 2010 #17
    Dear ansgar,

    Thank you for your kind reply.

    One last question.
    In the detector and in the signal analysis can you tell the difference between a photon with spin 2 and a graviton?

    Cheers mate,
  19. May 11, 2010 #18
    I kknow that there was some mumbo jumob behind all of this

    gravitions does not interact electromagnetically

    I am not your mate
  20. May 11, 2010 #19
    Dear ansgar,

    Mumbo jumob? They are simple questions...

    The question:
    Can you really have a particule with spin 2 without electromagnetic perturbation?
    Can you explain why?

    Or are they dogmas?

    Can I google it?

    cheers mate,
  21. May 11, 2010 #20
    It seems that at some level you can model gravitons seem to be modeled by spin 2 particles.

    Not really.

    Observations. Some particles we see existing. Some particles we don't.
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