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A global team of scientists, including a University of Mississippi physicist, has determined the best constraint on the mass of photons so far, using observations of super-massive black holes. The research findings appear in the September issue of Physical Review Letters, one of the most prestigious, peer-reviewed academic journals in the field. "Black hole bombs and photon mass bounds" is co-authored by Emanuele Berti, UM assistant professor of physics and astronomy, along with fellow researchers Paolo Pani, Vitor Cardoso, Leonardo Gualtieri and Akihiro Ishibashi. This paper details how the scientists, who work in Portugal, Italy, Japan and the U.S., found a way to use astrophysical observations to test a fundamental aspect of the Standard Model – namely, that photons have no mass – better than anyone before. Read more at: phys.org...
"With this technique, we have succeeded in constraining the mass of the photon to unprecedented levels: the mass must be one hundred billion of billions times smaller than the present constraint on the neutrino mass, which is about two electron-volts."
Photons are never at rest so it's impossible to measure their mass when they're at rest.
Originally posted by ubeenhad
Wouldnt it be crazy if photons have mass?
And that's what's happened in the OP linked article, we've placed limits on it.
Is there any experimental evidence that the photon has zero rest mass?
Alternative theories of the photon include a term that behaves like a mass, and this gives rise to the very advanced idea of a "massive photon". If the rest mass of the photon were non-zero, the theory of quantum electrodynamics would be "in trouble" primarily through loss of gauge invariance, which would make it non-renormalisable; also, charge conservation would no longer be absolutely guaranteed, as it is if photons have zero rest mass. But regardless of what any theory might predict, it is still necessary to check this prediction by doing an experiment.
It is almost certainly impossible to do any experiment that would establish the photon rest mass to be exactly zero. The best we can hope to do is place limits on it.
Originally posted by ubeenhad
But somethings got to give somewere
You would need a lot of tungsten, and even if you could put enough of it in one place to provide comparable results, it would still collapse into a black hole, wouldn't it?
Originally posted by Soloro
Wouldn't observing photon interaction within a super dense material like tungsten provide similarly useful data?
Originally posted by twistedlogic
reply to post by ubeenhad
Lol its responses like that, that make you sound like a troll. No personal jabs at you, but responding with a hostile tone.
Theres no winning with you.
Adios my friend, take it easy.