String theory - wikipedia.org  ## Metadata - Author: **wikipedia.org** - Full Title: String theory - Category: #articles - URL: https://en.wikipedia.org/wiki/String_theory ## Highlights - In [physics](https://en.wikipedia.org/wiki/Physics), **string theory** is a [theoretical framework](https://en.wikipedia.org/wiki/Mathematical_theory) in which the [point-like particles](https://en.wikipedia.org/wiki/Point_particle) of [particle physics](https://en.wikipedia.org/wiki/Particle_physics) are replaced by [one-dimensional](https://en.wikipedia.org/wiki/Dimension_(mathematics_and_physics)) objects called [strings](https://en.wikipedia.org/wiki/String_(physics)). String theory describes how these strings propagate through space and interact with each other. On distance scales larger than the string scale, a string looks just like an ordinary particle, with its [mass](https://en.wikipedia.org/wiki/Mass), [charge](https://en.wikipedia.org/wiki/Charge_(physics)), and other properties determined by the [vibrational](https://en.wikipedia.org/wiki/Vibration) state of the string. In string theory, one of the many vibrational states of the string corresponds to the [graviton](https://en.wikipedia.org/wiki/Graviton), a [quantum mechanical](https://en.wikipedia.org/wiki/Quantum_mechanics) particle that carries the [gravitational force](https://en.wikipedia.org/wiki/Gravity). Thus, string theory is a theory of [quantum gravity](https://en.wikipedia.org/wiki/Quantum_gravity). ([View Highlight](https://read.readwise.io/read/01jwagbbhc2bs6ng1z6xfd8zqp))