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The graviton is the (hypothetical) quantum of the field of gravity, i.e., the quanta of the theory of quantum gravity.
In firstorder formulation of gravity a field configuration is locally a Lie algebravalued form
with values in the Poincare Lie algebra.
This is a vielbein $E$ and a spin connection $\Omega$. This together is the graviton field.
A graviton has spin $2$, and is massless. We can see that it has spin $2$ from the fact that the source of gravity is $T$, the energymomentum tensor, which is a secondrank tensor. It can be shown that a massless spin$2$ particle has to be a graviton. The basic concept behind this is that massless particles have to couple to conserved currents  the stressenergy tensor $T$, the source of gravity.
In supergravity this is accompanied by the gravitino.
Last revised on May 24, 2014 at 05:14:56. See the history of this page for a list of all contributions to it.