Newtonian Gravity Vs. Quantum Gravity

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Thread starter Quantum Physics
Start date Mar 8, 2019
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Gravity Newtonian Newtonian gravity Quantum Quantum gravity Quantum mechahnics

In summary, Newtonian Gravity and Quantum Gravity are two different theories that explain the force of gravity. Newtonian Gravity is a classical theory based on the idea of universal, attractive force between objects with mass, while Quantum Gravity attempts to reconcile quantum mechanics with general relativity to explain gravity at a quantum level. Both theories have been extensively tested and are considered accurate in their respective domains. However, Newtonian Gravity breaks down at small scales and Quantum Gravity is still a developing theory. Many scientists are working on unifying these two theories to create a comprehensive theory of gravity, but it is still in its early stages. The understanding of gravity has practical applications in daily life such as predicting motion, satellite navigation, and space travel. It also plays a crucial

Mar 8, 2019

Quantum Physics

I want to know the differences between Newtonian Gravity and Quantum Gravity

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Mar 8, 2019

PeterDonis

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Insights Author

This is much too broad for a PF discussion. You will need to take the time to learn the basics of each of these for yourself, and then come back with a more specific question about the differences between them when you find something you don't understand.

Thread closed.

Related to Newtonian Gravity Vs. Quantum Gravity

1. What is the difference 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.

2. How does Newtonian Gravity explain the behavior of large objects, while Quantum Gravity explains the behavior of subatomic particles?

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.

3. Can Newtonian Gravity and Quantum Gravity be unified?

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.

4. How does the concept of spacetime differ in Newtonian Gravity and Quantum Gravity?

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.

5. Are there any experimental evidence or observations that support the existence of Quantum Gravity?

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.