The development of string theory from "summary" of The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory by Brian Greene
String theory has a fascinating history, marked by numerous breakthroughs and setbacks over the years. The theory emerged as a way to reconcile the fundamental principles of quantum mechanics and general relativity, two pillars of modern physics that seemed incompatible. These principles govern the behavior of particles at the smallest scales and the dynamics of spacetime on the largest scales, respectively. The origins of string theory can be traced back to the study of hadrons, particles made up of quarks held together by the strong nuclear force. Physicists were puzzled by the behavior of hadrons and sought a more elegant explanation for their interactions. This led to the development of a theoretical framework based on one-dimensional objects called strings, which vibrate at different frequencies to give rise to different particles. As string theory evolved, researchers realized that it offered a unified description of all fundamental forces, including gravity. This was a major breakthrough, as previous theories had failed to incorporate gravity ...
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