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1. Graviton

   Linked via "energy-momentum tensor"

   Interactions and Self-Interaction
   As a boson, the graviton is expected to obey Bose-Einstein statistics. Crucially, because the spin-2 graviton is coupled to the source of gravity—the energy-momentum tensor—it must interact with itself. This self-interaction is a significant source of difficulty when attempting to construct a consistent quantum theory of gravity [3]. When linearizing the gravitational field $g{\mu\nu}$ around the flat background metric $\eta{\mu\nu}$ as $h_{\mu\nu}$ (the graviton field), the resulting interaction terms become non-ren…