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anonymous
 one year ago
How massive is photons?
anonymous
 one year ago
How massive is photons?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How are photons often drawn?

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.0\(\gamma\) inside the customary little ball

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@IrishBoy123 thank you

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3photon 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: \[\Large {m_\gamma } \leqslant {10^{  48}}{\text{grams}}\]

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.0@Michele_Laino Hey, how would you even measure that, or is that one of the results from the relativity equations?

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.0i reckon this is a great answer  there's some physics wordplay going on here https://www.physicsforums.com/threads/dophotonshavemass.511175/

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3no, many experiments are made in order to establish the mass of the photon

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3here 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
 one year ago
Best ResponseYou've already chosen the best response.3subsequently 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
 one year ago
Best ResponseYou've already chosen the best response.3where: \[\Large {F_{\alpha \beta }},\;{A_\alpha },\;{J_\alpha }\] 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
 one year ago
Best ResponseYou've already chosen the best response.3I 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
 one year ago
Best ResponseYou've already chosen the best response.0Awesome, 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
 one year ago
Best ResponseYou've already chosen the best response.3yes! I can attach my paper as PDF file here

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.0@Michele_Laino you're an awesome resource in these parts!

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3thanks! :) @IrishBoy123

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.0That would be great! Haha yes Michele is!

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3ok! please wait a moment, since I have to retrieve my article @Astrophysics

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.0No problem! Take your time :)

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3here is my article:

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.0Awesome, thank you! I will read over it and if I have questions I will message you!
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