String Theory

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String Theory

This is a very short summary about what string theory is. For more information, please visit Wikipedia.

String theory is a physical theory which attempts to unify the Standard Model with General Relativity, as well as to give a unified description of all forces and particles. It is, therefore, a candidate for a Theory of Everything.

In string theory, particles such as electrons are not point-like, but 1-dimensional objects called strings. These strings can vibrate at different frequencies, thus giving rise to the whole myriad of particles in the standard model. In string theory, every single particle -be it a an electron or a photon- is just a string vibrating at a different frequency.

One of the most shocking properties of string theory is that it requires space-time to be 10-dimensional in order to be consistent. The extra dimensions we do not observe are thought to be curled up into a tiny radius, and some physicists hope to observe some trace of their existence in particle collider experiments.

Even though it has been developing for more than 30 years, string theory still has made no testable experimental predictions. This has led many physicists to lose hope in the theory, even though as of today very few alternatives have been suggested for a Theory of Everything.

For more information, see the Wikipedia article or visit the official String Theory website.

Talk at Ted by Brain Greene on String Theory.

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