Are gravitons virtual or real.

[Paulanddiw]

Maybe this thread should not be here.
Are gravitons virtual or real. I've read that they are bosons, but... Also, are they expected to have momentum, virtual or otherwise?

Thanks

 

[dextercioby]

They can be, just as photons, both virtual and real. Einstein (or Pauli-Fierz) gravitons are massless.

Daniel.