OT - Scientific proof that there is no afterlife!

[Slick]

Originally posted by Imperator Fyron:

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Originally posted by Suicide Junkie:

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Originally posted by Slick:
Why is it that people are insisting that photons have mass when all available evidence and theory are contrary to that? I just don't understand it.

SJ, nice try , but that calculation shows how much mass would be generated if the photon was completely anihilated. It does not show how much mass a photon has. This has been observed, by the way, in a process called "pair production". A photon (gamma) of at least 1.02 MeV can be transformed (E=mc^2) into an electron and a positron. There must be 2 particles due to conservation laws (momentum, spin, charge, etc.) beyond the scope of this discussion.

Slick.

Photons have no rest mass. At rest, they have no energy either and don't exist anymore.

The relativistic mass is a different question.
See:
http://math.ucr.edu/home/baez/physic...oton_mass.html (University of California site)
Edit: better link

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Exactly my point. Thanks SJ.

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*sigh* From that very article:

The overwhelming consensus among physicists today is to say that photons are massless.

It also says:

If the rest mass of the photon was non-zero, the theory of quantum electrodynamics would be "in trouble" primarily through loss of gauge invariance, which would make it non-renormalizable; also, charge-conservation would no longer be absolutely guaranteed, as it is if photons have vanishing rest-mass.

Which means that if a photon has mass, we basically are totally wrong about quantum electodynamics, which has been verified by numerous experiments.

Believe what you want. I give up. It no longer "matters" to me if you want to believe it or not. You don't need to attempt to convince me that you are right and I am wrong. I will continue to do my day job testing submarine reactors for the US navy at Pearl Harbor Naval Shipyard. I have been doing nuclear engineering for over 13 years and I am very comfortable with my knowledge of physics. I do not have the need to have the Last word on this. I'm out of this discussion.

Slick.

[ August 20, 2003, 01:49: Message edited by: Slick ]