Graviton bosonic degrees of freedom

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Neitrino
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Hi,

Could you pls advise me why in on-shell case graviton has two degrees of freedom?
and in general how do I calculate bosonic or fermionic degrees of freedom of any particle?

I was reading some books about supersummetry and stuck when they said gravitopn has two degrees of freedom and gravitiono also...

thanks a lot
 
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