Question

is graviton particle really exist

Answer 1

Yes!!!!!
My Friend..

Answer 2

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Einstein's theory of general relativity (GR) implies the existence of gravitons, because GR predicts the existence of classical gravitational waves. This existence of gravitons is implied even if the underlying quantum theory of space time is radically different from GR—for example, string theory or loop quantum gravity, both of which are quite different from GR. The reason is that any underlying theory has to reproduce GR in an appropriate limit. So a "graviton" might not be a fundamental particle (just like the pion is composite), but the graviton has to emerge at the same time as GR emerges from the underlying theory. In fact, any reasonable modification to GR which is consistent with present observational data also implies the existence of gravitons

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"NIKHIL"