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Instanton
An
instanton
(or
pseudoparticle
) is a notion appearing in theoretical and
mathematical physics
. An instanton is a classical solution to
equations of motion
with a ,
non-zero action
, either in
quantum mechanics
or in
quantum field theory
. More precisely, it is a solution to the equations of motion of the
classical field theory
on a
Euclidean
spacetime
.
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