The Cooperation Between Loop Quantum Gravity and Entropic Gravity

Abstract

The so-called new interpretation of the entropy of gravity belongs to a non-mainstream branch of gravity research for a long time. The core idea is that gravity is a statistical phenomenon; it is not fundamental, like the other three basic interactions. The statistical origin of gravity first came from the hint of black hole thermodynamics. For example, the famous Bekenstein-Hawking entropy formula in the early 1970s. The more famous work followed was that in the mid-1990s, T. Jacobson derived Einstein's equations based on the thermodynamics of black holes-the basic equations of general relativity. That is, Einstein's equation is actually the state equation of the space-time thermodynamic system. The most recent development is the entropy interpretation of gravity mentioned by the subject, which was proposed by E. Verlinde in early 2010. At that time, it attracted considerable attention. is a macroscopic force that describes the system's response to changes in entropy. A typical example is the elasticity of rubber bands. The entropy of Verlinde can be roughly explained as: there is a (hypothetical) holographic surface between two objects. When the distance between the two objects changes, the entropy on this holographic surface will also change, resulting in a change in system energy. The system always tends to increase in entropy, so gravity is reacted in the response to this change. In this explanation, the holographic principle is the basic principle, while the general theory of relativity is presented layer by layer. Entropy belongs to the so-called emergent phenomena in condensed matter physics, that is, a phenomenon that only appears on a certain level.