The prediction of gravitational waves by string theory from "summary" of The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory by Brian Greene
String theory, a theoretical framework that aims to provide a unified description of all fundamental forces and particles in the universe, has made a remarkable prediction regarding the existence of gravitational waves. These waves are ripples in the fabric of space-time, caused by the motion of massive objects such as black holes or neutron stars. According to string theory, these waves should exist, and their detection would be a crucial test of the theory's validity. The prediction of gravitational waves by string theory arises from the fundamental premise that all particles in the universe are not point-like entities but rather tiny vibrating strings. These strings can oscillate in different modes, giving rise to the diverse particles and forces observed in nature. In this framework, gravity is no longer described by the curvature of space-time as in general relativity but is instead mediated by closed loops of strings known as gravitons. When two massive objects orbit each other, they emit gravitational waves that carry away energy, causing the objects to spiral inward and eventually merge. This process results in a characteristic pattern of gravitational waves that can be detected by sensitive...
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