Quantum Gravity
IntroBooks
Feb 2018 · IntroBooks
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Some of these oscillatory states will be rendered massless particles due to them being in the zero energy state. Another state with spin two is observed and is also known as the graviton. The masses of the massive string states are of the order m ≥ 1/ls. String interactions gets introduced by letting the strings touch each other and then get attached into one single string - These are basically the joining and splitting interactions of strings.
The simplest of string theories are the ones that live in ten dimensions and are observed to be supersymmetric. The sum over string theory which are emphasized with Feynman diagrams can be performed and yields finite results. At considerable low energies to the likes of energies lower than mass of the massive string states E ≪ 1/ls the only excitation we will have are gravitons and other massless particles. The interactions of these particles are those of some massless fields and also of Einstein gravity fields.This is exactly how string theory quantize the gravity. The description above is nothing except the perturbative quantization of the theory.
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