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Given that the Standard Model states that only three families exist, and given that gravitons can exist with mass, why could it not be implied that there are also three graviton types?:

[tex]g^0_e[/tex] - electro-graviton

[tex]g^0_\mu[/tex] - mu-graviton

[tex]g^0_\tau[/tex] - tau-graviton

Given that no primordial graviton Cosmic Background Radiation exists, can it also be implied that all 'implied gravitons' must have a short 'lifetime'?

Given that gravitons have a short 'lifetime', what could have been their most probable decay products?

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# Quantum Gravitons

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