In loop quantum gravity, space-time is a network, and nodes replace the smooth background of Einstein’s theory of gravity. Category: Quantum Gravity and String Theory [1743] viXra:2010.0032 submitted on 2020-10-05 21:22:17. String Theory vs E8 and Quantum Gravity Research vs ? That's what I wanted to make clear. Like chunky space, string theory averts gravitational catastrophe by introducing a finite, smallest scale to the universe, although the unit strings are drastically smaller even than the spatial structures Hogan is … Consider the ideas of loop quantum gravity and string theory. String theory is an application of quantum theory (like quantum mechanics and quantum field theory). Different particles, in this theory, represent different vibrational patterns in these strings. But string theory's universe in a box has a different shape from the one we see (although Engelhardt said this difference may not be a deal breaker, since quantum gravity could act … In post #1 the question was about the difference between quantum theory and string theory. No Gravity Shield in … String theory posits that every object in the universe consists of vibrating strings of energy. That does not make sense. (Look at the vertices in a Feynman diagram, they are 0-dimensional points.) General Relativity, which implicitly interprets gravity as curvature in four-dimensional space-time, is built into the basic precepts of superstring theory in a way that may be consistent with quantum mechanics, and so it is hoped that the long-sought synthesis between gravity and quantum theory will naturally emerge. So I wanted to stress this difference whereas you want to stress the common features. You may have to register before you can post: click the register link above to proceed. String theory is a background-dependent theory (built on a fixed framework), so it doesn’t currently account for the dynamic nature of space-time at the heart of relativity. To start viewing messages, select the forum that you want to visit from the selection below. What's the difference between string theory and QFT? Loop quantum gravity: Loop quantum gravity is a canonical quantization approach for Hamiltonian formulation of Einstein's general theory of relativity. Keywords: Theory of Everything, String Theory, Loop Quantum Gravity, General Relativity, Quantum Mechanics, Cosmology, Spacetime. JB: Loop quantum gravity is an alternative to string theory, which in its earliest formulation says that particles are composed of one-dimensional lines or strings of energy. Although a lot people are in denial about this, QFT is really a quantum theory about point particles. If this is your first visit, be sure to check out the FAQ by clicking the link above. Loop quantum gravity is an attempt to combine quantum mechanics and general relativity as a way to understand quantum gravity.
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