# Count degrees of freedom of gauge tensors

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For degrees of freedom (dof)

- it is said that spin-1 massless boson like photon has 2 dof in 4d, like U(1) gauge theory.

- it is said that spin-2 massless boson like photon has 2 dof in 4d, like Einstein gravity theory.

>Can we demonstrate the following dof counting of gauge bosons of the
gauge theories:

>- What is the dof of 3d U(1)$_k$ Chern-Simons theory?

>- What is the dof of 4d SU(n) non-abelian gauge theory?

>- What is the dof of any d-dim Einstein gravity of spin-2 bosons?

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