Graviton is the quantum field vector gauge boson of the gravitational field. Unlike photons, which cannot interact with one another, the gravitons are able to interact with each other, theoretically. The failure to detect a single graviton should never be construed as a hindrance for theorizing graviton interaction. The spin of the photon is unity, while that of graviton is two. By infinitesimal congruence, the graviton is the inscribed and the photon is the circumscribed Feynman loop of spacetime. This suggests that for every set of 8 spacetime points of a photon there corresponding 4 gravitons and 4 antigravitons. Each graviton is a coupling of two Feynman loops of the same gauge but of opposite spin. Nevertheless, each loop is describable by a singular Hadamard matrix. This matrix representation reduces the infinite degrees of freedom to only six making the graviton field renormalizable. Furthermore, the existence of photons is a testament for stable interactions between gravitons and antigravitons. Along same reasoning, a spin zero scalar massive Higgs boson is the product of multiple Hadamard matrices.