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No, conservation of Baryon number prevents a neutron decaying into gravitons. A neutron has Baryon number $B=1$. A graviton (or any gauge boson or lepton) has $B=0$. And famously, $1\neq0$.

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This is the relative strength of interactions of elementary particles: strong 1 electromagnetic 1/137 weak 10^-6 gravity 6x10^-39 A free neutron decays through the weak interaction with a lifetime of 14.7 minutes. The gravitational interaction is 10^-33 times weaker than the weak. In the lifetime computations this would be squared .Even if baryon ...

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There's a very real phenomenon called 'Gravitational Lensing', in which light is bent from its original trajectory by a massive enough cluster of matter (which curves the space-time around it). Moreover, it's bent by a different amount than predicted by a simply application of Newtonian ideas, as kindly pointed out by Rob Jeffries. Is this evidence enough? ...

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There is no %100 proof in science; at least not for good science. It's always a question of being the most accurate / descriptive / useful theory. For example, Newtonian gravity is 'true' to the extent that it is very effective in a huge diversity of situations. General Relativity (GR) includes all of the accuracies of Newtonian Gravity, and then also ...

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I found the Weinberg passage, but to quote it I need to do it in an answer (too long). So here it goes. We have seen in this chapter that the nonvanishing of the tensor $R_{\lambda \mu \nu \kappa}$ is the true expression of the presence of a gravitational field. We also saw in Chapter 1 that Gauss was led to introduce the Gaussian curvature $K = -R/2$ as ...

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Yes, all particles, atoms, and molecules smaller than about a C60 molecule exhibit both wave and particle properties. It's not until the object is larger than its wave function that it begins to lose its wave nature.

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In physics, gravitational waves are ripples in the curvature of spacetime which propagate as waves, travelling outward from the source. Predicted in 19161 by Albert Einstein to exist on the basis of his theory of general relativity,3 gravitational waves theoretically transport energy as gravitational radiation. Sources of detectable gravitational waves ...

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