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anonymous

  • one year ago

How massive is photons?

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  1. anonymous
    • one year ago
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    How are photons often drawn?

  2. IrishBoy123
    • one year ago
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    \(\gamma\) inside the customary little ball

  3. anonymous
    • one year ago
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    @IrishBoy123 thank you

  4. Michele_Laino
    • one year ago
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    photon is a massless particle, even if the current theory doesn't deny the hypothesis for a not massless photon. Current researches give this limit for photon mass: \[\Large {m_\gamma } \leqslant {10^{ - 48}}{\text{grams}}\]

  5. rvc
    • one year ago
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    thanks @Michele_Laino

  6. Michele_Laino
    • one year ago
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    :) @rvc

  7. Astrophysics
    • one year ago
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    @Michele_Laino Hey, how would you even measure that, or is that one of the results from the relativity equations?

  8. IrishBoy123
    • one year ago
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    i reckon this is a great answer - there's some physics wordplay going on here https://www.physicsforums.com/threads/do-photons-have-mass.511175/

  9. Michele_Laino
    • one year ago
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    no, many experiments are made in order to establish the mass of the photon

  10. Michele_Laino
    • one year ago
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    here is a reference about an experiment on the photon mass: P.A. Franken and G.W. Ampulski, Phys. Rev. Letters 26, 115 (1971)

  11. Michele_Laino
    • one year ago
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    subsequently many others experiments are made starting from the Proca equations, which substitute the Maxwell equations, if the photon is not massless. Those equations can be derived by the Proca Lagrangian: \[\Large {L_{{\text{Proca}}}} = - \frac{1}{{16\pi }}{F_{\alpha \beta }}{F^{\alpha \beta }} + \frac{{{\mu ^2}}}{{8\pi }}{A_\alpha }{A^\alpha } - \frac{1}{c}{J_\alpha }{A^\alpha }\]

  12. Michele_Laino
    • one year ago
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    where: \[\Large {F_{\alpha \beta }},\;{A_\alpha },\;{J_\alpha }\] are the electromagnetic tensor, quadrivector potential, and quadrivector density current respectively, furthermore: \[\Large \mu = \frac{{{m_{ph}}c}}{\hbar }\] m_ph is the photon mass

  13. Michele_Laino
    • one year ago
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    I have written a scientific paper on the photon mass, and I have showed that if the photon has a mass, then another quantum action has to exist. nevertheless my article is unpublished

  14. Astrophysics
    • one year ago
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    Awesome, thanks for the information guys! I also read the link you gave @IrishBoy123 thank you. @Michele_Laino Is it possible I could get a copy, I would like to give it a read, sounds very interesting. Thanks again :)

  15. Michele_Laino
    • one year ago
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    yes! I can attach my paper as PDF file here

  16. IrishBoy123
    • one year ago
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    @Michele_Laino you're an awesome resource in these parts!

  17. Michele_Laino
    • one year ago
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    thanks! :) @IrishBoy123

  18. Astrophysics
    • one year ago
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    That would be great! Haha yes Michele is!

  19. Michele_Laino
    • one year ago
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    ok! please wait a moment, since I have to retrieve my article @Astrophysics

  20. Astrophysics
    • one year ago
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    No problem! Take your time :)

  21. Michele_Laino
    • one year ago
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    ok!

  22. Michele_Laino
    • one year ago
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    here is my article:

  23. Astrophysics
    • one year ago
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    Awesome, thank you! I will read over it and if I have questions I will message you!

  24. Michele_Laino
    • one year ago
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    ok! :)

  25. Astrophysics
    • one year ago
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    Thanks again

  26. Michele_Laino
    • one year ago
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    :)

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