In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other.

2013年4月24日 · String theory is developed by writing down the action (which is the area of the string world sheet), using this to find the (classical) equations of motion, trying to find a consistent quantisation of these (building in supersymmetry somewhere along the way) then solving the resulting impossibly messy and hard equations using perturbation theory.

String theory is a candidate for a unified theory of the four fundamental forces of nature: electromagnetism, the weak force, the strong force, and gravity. Particles in string theory are identified with particular patterns of vibration of a one-dimensional elementary object called a …

2015年11月1日 · String theory has, even among theoretical physicists, the reputation of being mathematically intimidating. But many of its essential elements can actually be described simply. This article aims to answer a few basic questions. How does string theory generalize standard quantum field theory?

String theory is a theoretical framework that tries to tackle the problems of how and why the universe is like what it is now. In string theory, point-like particles are replaced by one-dimensional entities called strings. String theory explains how these …

2022年4月25日 · String theory is integral to discovering wormholes' (derived solutions to Einstein's equations) level of stability. Specifically, string theory's quantum forces and gravity enables the determination of the radiative effects and …

In this report a short historical and theoretical introduction to string theory is given. This is fol-lowed by a discussion of the point particle action, leading to the postulation of the Nambu-Goto and Polyakov action for the classical bosonic string. The equations of motion from these actions are derived, simplified and generally solved.