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I have a question about general relativity and the hypothetical
graviton. It is my understanding that the presence of a massive
object alters the geometry of spacetime thus causing the
observed motion of free particles in the vicinity of the massive
object. The particles aren’t experiencing a force but simply
following the contours of spacetime.
The question is, why would anyone think that there would be an
exchange particle governing the (non-existent) interaction
between the massive object and any one of the particles.
The answer I have come across is that general relativity is a
field theory and fields can be quantized—the graviton is the
quantum of the field.
Then the question becomes, what is the field? Is it spacetime
itself?
This page http://www.quantum-field-theory.net/einstein-didnt-say/
has another suggestion. Is that page a bunch of nonsense?