The interaction of quantum mechanics and gravity is not yet fully understood, and it remains one of the biggest unsolved problems in theoretical physics. The standard model of particle physics, which describes quantum particles and their interactions, does not include gravity. On the other hand, our best description of gravity, which is Albert Einstein's theory of general relativity, is a classical theory and doesn't take quantum effects into account.
In the realm where both quantum effects and gravity are important, such as near black holes or during the Big Bang, we don't have a fully satisfactory theory yet. This is the realm of quantum gravity, and it's an area of active research.
Several theories have been proposed to reconcile the apparent contradictions between quantum mechanics and general relativity, including string theory and loop quantum gravity, but none of them have been confirmed by experimental evidence as of 2021.
Therefore, while gravity seems to affect classical particles in a way that is well-understood through general relativity, how it affects quantum particles is still a question open to investigation and remains one of the most fascinating topics in modern physics. We simply don't know yet whether quantum particles obey the same laws of gravity as classical particles, or whether there's a quantum version of gravity that differs from the classical one.
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