A graviton is the massless spin-two quantum of the gravitational field. It occurs in the symmetric trace-free transverse sector of the first massless closed string level.
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In the realm of physics, a graviton is a hypothetical elementary particle that mediates the force of gravitation in quantum field theory. According to quantum mechanics, forces between particles are usually transmitted by other particles known as "force carriers" or "gauge bosons." For example, photons are the force carriers of electromagnetic force, while W and Z bosons mediate weak nuclear force.
