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The Question
(Submitted March 19, 1998)
What is the graviton?
The Answer
In quantum theory, force is mediated by an exchange of virtual particles.
Although general relativity is a classical, not a quantum, theory,
we expect that gravity is also mediated by a particle. We call
this the graviton.
Best wishes,
Koji Mukai
for Ask an Astrophysicist
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