string theory


string theory

noun

Definition of STRING THEORY

:  a theory in physics: all elementary particles are manifestations of the vibrations of one-dimensional strings

First Known Use of STRING THEORY

1973

string theory

noun    (Concise Encyclopedia)

Any of a number of theories in particle physics that treat elementary particles (see subatomic particle) as infinitesimal one-dimensional “stringlike” objects rather than dimensionless points in space-time. Different vibrations of the strings correspond to different particles. Introduced in the early 1970s in attempts to describe the strong force, string theories became popular in the 1980s when it was shown that they might provide a fully self-consistent quantum field theory that could describe gravitation as well as the weak, strong, and electromagnetic forces. The development of a unified quantum field theory is a major goal in theoretical particle physics, but inclusion of gravity usually leads to difficult problems with infinite quantities in the calculations. The most self-consistent string theories propose 11 dimensions; 4 correspond to the 3 ordinary spatial dimensions and time, while the rest are curled up and not perceptible.

Browse

Next Word in the Dictionary: string tie
Previous Word in the Dictionary: stringsman
All Words Near: string theory

Seen & Heard

What made you want to look up string theory? Please tell us where you read or heard it (including the quote, if possible).