# String background

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In [theoretical physics](/source/Theoretical_physics), a **string background** refers to the set of classical values of [quantum fields](/source/Quantum_field) in [spacetime](/source/Spacetime) that correspond to classical solutions of [string theory](/source/String_theory).[1] Such a background is associated with [geometry](/source/Geometry) that solves [Einstein's field equations](/source/Einstein's_field_equations) (with higher order corrections) or their generalizations and with the values of other fields. These fields may encode the information about the shape of the hidden dimensions; the size of various [electromagnetic fields](/source/Electromagnetic_field) and their generalizations; the values of fluxes; and the presence of additional objects such as [D-branes](/source/D-brane) and [orientifold](/source/Orientifold) planes. The full physics of string theory can always be thought of as a system of infinitely many quantum fields expanded around a given string background.

## See also

- [Background independence](/source/Background_independence)

## References

1. **[^](#cite_ref-1)** Honda, Masaki; Sato, Matsuo; Tohshima, Taiki (2021-08-17). Shamir, Muhammad Farasat (ed.). ["Superstring Backgrounds in String Geometry"](https://doi.org/10.1155%2F2021%2F9993903). *Advances in High Energy Physics*. **2021**: 1–7. [arXiv](/source/ArXiv_(identifier)):[2102.12779](https://arxiv.org/abs/2102.12779). [doi](/source/Doi_(identifier)):[10.1155/2021/9993903](https://doi.org/10.1155%2F2021%2F9993903).

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