Adjective
Tending to cause perturbation; disturbing.
Source: Webster's dictionaryDeveloped by Richard Feynman and others in the first half of the twentieth century, perturbative quantum field theory uses special diagrams called Feynman diagrams to organize computations. Source: Internet
A graviton in perturbative string theory is a closed string in a very particular low-energy vibrational state. Source: Internet
Renormalization Early in the history of quantum field theory, it was found that many seemingly innocuous calculations, such as the perturbative shift in the energy of an electron due to the presence of the electromagnetic field, give infinite results. Source: Internet
When calculating the fluctuations with a perturbative approach, the zero order approximation is Fick's law. Source: Internet
In the perturbative approach to quantum field theory, the full field interaction terms are approximated as a perturbative expansion in the number of particles involved. Source: Internet
More precisely, one cannot apply the methods of perturbative quantum field theory. Source: Internet