In theories of quantum gravity, the graviton is the hypothetical elementary particle that mediates the force of gravitational interaction.
If it exists, the graviton is expected to be massless because the gravitational force has a very long range and appears to propagate at the speed of light.
Owing to a phenomenon known as color confinement, quarks are never found in isolation; they can be found only within hadrons, which include baryons (such as protons and neutrons) and mesons, or in quark–gluon plasmas.
Color superconductivity is a phenomenon where matter carries color charge without loss, analogous to the way conventional superconductors can carry electric charge without loss.
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