In theoretical physics, a spurion is a fictitious, auxiliary field in a quantum field theory that can be used to parameterize any symmetry breaking and to determine all operators invariant under the symmetry. The procedure begins with finding a parameter that measures the amount of symmetry breaking. This parameter is promoted to a field, i.e. to ...
Found on
http://en.wikipedia.org/wiki/Spurion
any hypothetical subatomic particle used to facilitate calculations
Found on
http://phrontistery.info/s.html
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