More details on both the theories can be found here and here. The first three are governed by the laws of quantum mechanics. So the difference in philosophies between the two theories is: Quantum Gravity tries to describe gravity as a fundamental force (like electromagnetic, strong and weak forces), while Emergent/entropic gravity does not consider gravity a force but rather an phenomena observed in macroscopic objects due to the statistical behaviour at microscopic scales. By Professor Sumit Das, College of Arts & Sciences Distinguished Professor (2019) As far as we know, almost all natural phenomena stem from four fundamental interactions: electromagnetism, weak interaction, strong interaction, and gravity. This theory actually comes from a consideration of the Holographic principle. According to entropic gravity, gravity is just an emergent phenomenon (it is observed for large, macroscopic objects, but not for microscopic constituents of the large object). But entropic gravity does away with the idea of gravity as a force entirely. It also predicts that there should be another fundamental particle, the graviton which is the particle 'communicating' the force of gravity. The difference between quantum gravity and emergent gravity is that quantum gravity tries to describe gravity as another fundamental force, which can be explained by the fundamental principles of quantum mechanics and quantum field theory. it arises as any system's tendency to increase its entropy.
According to this theory, gravity is an entropic force, i.e. Emergence means that you observe some phenomena in an object at a macroscopic scale, but don't observe it when you look at tiny parts of the object. But both are yet to be experimentally verified.Įmergent / entropic gravity is a rather recent theory. In this paper we present a preliminary discussion of the impact of critical behavior of certain microscopic models.
Quantum gravity is still an unsolved mysteries, but candidates include string theory and Loop Quantum Gravity, which tries to quantize spacetime itself. While the idea of gravity as an emergent phenomenon is an intriguing one, little is known about concrete implementations that could lead to viable phenomenology, most of the obstructions being related to the intrinsic difficulties of formulating genuinely pregeometric theories. An example would be the quantum effects found near black holes and in the early moments of the universe, jus after the Big Bang. Quantum gravity is needed in situations when you cannot just ignore quantum effects (even though you are talking about macroscopic objects). It uses fundamental principles of quantum physics (like quantization for example) and applies it to gravity. Quantum Gravity is the description of gravity according to the laws of quantum mechanics.
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