Gravity is not considered a force in the same sense as other fundamental forces like electromagnetism or the strong and weak nuclear forces. In Einstein's theory of general relativity, gravity arises as a curvature of spacetime caused by the presence of mass or energy. This means that objects do not experience a gravitational "force" in the same way that they experience the electromagnetic force, for example. Instead, the path that an object follows through spacetime is determined by the distribution of mass and energy in the universe.
However, even though gravity is not a force in the traditional sense, physicists still search for a theory of quantum gravity to understand how gravity behaves at very small scales. At these scales, the effects of quantum mechanics become important, and it is not clear how to reconcile the principles of quantum mechanics with the principles of general relativity. One approach to this problem is to try to find a theory of quantum gravity that can explain the behavior of gravity in the same way that quantum mechanics explains the behavior of other fundamental forces.
The graviton is a hypothetical particle that is thought to be associated with the force of gravity. It has not yet been observed, but if it exists, it could potentially help to explain how gravity behaves at the quantum level.
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