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--- models:classical_electrodynamics [2018/10/16 15:22]
77.176.221.124 [Concrete]
+++ models:classical_electrodynamics [2019/07/01 09:20] (current)
129.13.36.189 [Research]
@@ Line 71: / Line 71: @@
 This is known as premetric approach and is described in detail in the book  "Foundations of Classical Electrodynamics: Charge, Flux, and Metric" by F. W. Hehl and Yu. N. Obukhov.
-In addition, the electrodynamics and especially the Maxwell equations are modified if [[models:speculative_models:axion|axions]] exist. This is known as [[https://inspirehep.net/record/1337434/files/26-Kuriksha.pdf|axion electrodynamics]] and was first noted in  F. Wilczek, Phys. Rev. Lett. 58, 1799 (1987).
+In addition, the electrodynamics and especially the Maxwell equations are modified if [[models:speculative_models:axion|axions]] exist. This is known as [[https://inspirehep.net/record/1337434/files/26-Kuriksha.pdf|axion electrodynamics]] and was first noted in  F. Wilczek, Phys. Rev. Lett. 58, 1799 (1987). The main idea here is that if the theta parameter can change in space and time $\theta=\theta(x,t)$, the term $\theta F \tilde F$ directly influences the equations of motion. This is discussed explicitly in Section 1.2 "The Theta Term" in [[http://www.damtp.cam.ac.uk/user/tong/gaugetheory/gt.pdf|Tong's lectures on gauge theory]].
 The Maxwell equations in the presence of axions read