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Quantum Physics
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I want to know the differences between Newtonian Gravity and Quantum Gravity
Newtonian Gravity is a classical theory that describes the force of gravity as a universal attraction between two masses. It is based on the concept of a gravitational field that permeates space. On the other hand, Quantum Gravity is a theory that aims to reconcile the principles of quantum mechanics with the concept of gravity. It suggests that gravity is not a force but rather a curvature of spacetime caused by the presence of matter.
Newtonian Gravity is effective in describing the behavior of large objects such as planets, stars, and galaxies, as their masses are significantly larger than the Planck mass (the mass at which quantum effects become significant). On the other hand, Quantum Gravity is necessary to explain the behavior of subatomic particles, as their masses are closer to the Planck mass and quantum effects become more significant.
Currently, there is no unified theory that combines Newtonian Gravity and Quantum Gravity. However, many physicists are working on developing theories that can reconcile the two and provide a complete understanding of gravity at all scales.
In Newtonian Gravity, spacetime is considered to be absolute and unchanging, while in Quantum Gravity, it is viewed as a dynamic and fluctuating entity. This is because in Quantum Gravity, the presence of matter causes spacetime to curve, and the curvature of spacetime affects the behavior of matter.
Currently, there is no direct experimental evidence for Quantum Gravity. However, some indirect evidence, such as the observation of gravitational waves, supports the concept of spacetime curvature predicted by General Relativity, which is a key component of Quantum Gravity theories. Further research and experiments are needed to fully understand and confirm the existence of Quantum Gravity.