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Originally Posted by JimJast
Both of course but what is your point? I didn't they MUST be the same they just MIGHT.
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The point was to keep you from confusing those who thought there was a difference between a photon and a graviton. Saying they
might be the same is like saying a chicken
might be the same as a poodle. Yes, they might, but you can see how the claim could be confusing.
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Both photons and gravitons have zero charge and zero rest mass. Why they can't have the same spin?
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Because they don't. A photon has spin 1, a graviton has spin 2. The former is experimentally established, the latter comes from the theory of gravity waves. More importantly, photons are very easy to detect, gravitons very difficult, so such a difference in property could not be from the same thing.