Abstract
Field equations of a given theory may be derived by taking functional derivatives of the corresponding action integral w.r.t. the fields appearing in the Lagrangian density \(\mathscr {L}(x)\) of the underlying theory and is referred to as the principle of stationary action.
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Notes
- 1.
For the rather non-trivial aspect of the rationale of the principle of stationary action, see Manoukian [1], pp. 146–150.
Reference
Manoukian, E. B. (2016). Quantum field theory. I: Foundations and abelian and non-abelian gauge theories. Switzerland: Springer.
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Manoukian, E.B. (2020). Lagrangians: Varying Action Integrals in QFT. In: 100 Years of Fundamental Theoretical Physics in the Palm of Your Hand. Springer, Cham. https://doi.org/10.1007/978-3-030-51081-7_21
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DOI: https://doi.org/10.1007/978-3-030-51081-7_21
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