anonymous
  • anonymous
How massive is photons?
Physics
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anonymous
  • anonymous
How massive is photons?
Physics
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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anonymous
  • anonymous
How are photons often drawn?
IrishBoy123
  • IrishBoy123
\(\gamma\) inside the customary little ball
anonymous
  • anonymous
@IrishBoy123 thank you

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Michele_Laino
  • Michele_Laino
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: \[\Large {m_\gamma } \leqslant {10^{ - 48}}{\text{grams}}\]
rvc
  • rvc
Michele_Laino
  • Michele_Laino
:) @rvc
Astrophysics
  • Astrophysics
@Michele_Laino Hey, how would you even measure that, or is that one of the results from the relativity equations?
IrishBoy123
  • IrishBoy123
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/
Michele_Laino
  • Michele_Laino
no, many experiments are made in order to establish the mass of the photon
Michele_Laino
  • Michele_Laino
here is a reference about an experiment on the photon mass: P.A. Franken and G.W. Ampulski, Phys. Rev. Letters 26, 115 (1971)
Michele_Laino
  • Michele_Laino
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: \[\Large {L_{{\text{Proca}}}} = - \frac{1}{{16\pi }}{F_{\alpha \beta }}{F^{\alpha \beta }} + \frac{{{\mu ^2}}}{{8\pi }}{A_\alpha }{A^\alpha } - \frac{1}{c}{J_\alpha }{A^\alpha }\]
Michele_Laino
  • Michele_Laino
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
Michele_Laino
  • Michele_Laino
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 nevertheless my article is unpublished
Astrophysics
  • Astrophysics
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 :)
Michele_Laino
  • Michele_Laino
yes! I can attach my paper as PDF file here
IrishBoy123
  • IrishBoy123
@Michele_Laino you're an awesome resource in these parts!
Michele_Laino
  • Michele_Laino
thanks! :) @IrishBoy123
Astrophysics
  • Astrophysics
That would be great! Haha yes Michele is!
Michele_Laino
  • Michele_Laino
ok! please wait a moment, since I have to retrieve my article @Astrophysics
Astrophysics
  • Astrophysics
No problem! Take your time :)
Michele_Laino
  • Michele_Laino
ok!
Michele_Laino
  • Michele_Laino
here is my article:
Astrophysics
  • Astrophysics
Awesome, thank you! I will read over it and if I have questions I will message you!
Michele_Laino
  • Michele_Laino
ok! :)
Astrophysics
  • Astrophysics
Thanks again
Michele_Laino
  • Michele_Laino
:)

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