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--- advanced_notions:quantum_field_theory:solitons [2018/03/26 11:16]
jakobadmin [Student]
+++ advanced_notions:quantum_field_theory:solitons [2018/04/02 15:10]
jakobadmin [Why is it interesting?]
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 <tabbox Why is it interesting?>
-[[advanced_tools:feynman_diagrams|Feynman diagrams]] do not describe everything that can happen in a [[theories:quantum_theory:quantum_field_theory|quantum field theory]]. There can be classical solutions of the field equations that describe larger lumps of field excitations that aren't describable by Feynman diagrams.
+[[advanced_tools:feynman_diagrams|Feynman diagrams]] do not describe everything that can happen in a [[theories:quantum_field_theory|quantum field theory]]. There can be classical solutions of the field equations that describe larger lumps of field excitations that aren't describable by Feynman diagrams.
 Classical solutions of the field equations with finite energy are called solitons.
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 In addition, there is an [[http://www.pbs.org/wgbh/nova/blogs/physics/2011/12/beautiful-losers-kelvins-vortex-atoms/|old dream]] that all elementary particles could be explained as topological solitons. (There are lots of problems with this idea, but at least, [[https://plus.google.com/+UrsSchreiber/posts/Z2LfHsyxgR8|instantons come somewhat close]].)
+While solitons are rare in particle physics, they are found frequently in condensed matter physics.
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