Editing Semiclassical physics (section)

== Instances ==

Some examples of a semiclassical approximation include:
* [[WKB approximation]]: electrons in classical external [[electromagnetic field]]s.
* [[semiclassical gravity]]: [[quantum field theory]] within a classical [[curved space|curved]] [[gravity|gravitational]] background (see [[general relativity]]).
* [[quantum chaos]]: quantization of classical [[Chaos theory|chaotic]] systems.
* magnetic properties of materials and astrophysical bodies under the effect of large magnetic fields (see for example [[De Haas–Van Alphen effect]])
* [[quantum field theory]]: only [[Feynman diagram]]s with at most a single closed loop (see for example [[one-loop Feynman diagram]]) are considered, which corresponds to the powers of the Planck constant.