A graviton is a hypothetical particle that 'transfers' gravitation's force (particles like this are known as gauge bosons) from its field. Gravitons have never been observed, directly or indirectly, however, there have been several theories that use gravitons to explain certain phenomena. For example, a theory that describes black holes by combining quantum mechanics and gravity, has been advanced by Georgi Dvali and Cesar Gomez, which suggests a black hole is "an overpacked bucket of gravitons".
|Particles in Physics|
|Elementary:||Fermions:||Quarks: up – down – strange – charm – bottom – top
Leptons: electron – muon – tau – neutrinos
|Bosons:||Gauge bosons: photon – W and Z bosons – gluons|
|Composite:||Hadrons:||Baryons: proton – neutron – hyperon|
|Mesons: pion – kaon – J/ψ|
|Atomic nuclei – Atoms – Molecules|
|Hypothetical:||Higgs boson – Graviton – Tachyon|
- Wei, Lisa (2003). "What is a graviton?". Curious about Astronomy. http://curious.astro.cornell.edu/question.php?number=535. Retrieved 2009-11-01.