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  • field theory - Trying to clarify the definition of an instanton . . .
    The definition of an instanton, in [this Wikipedia article], is: a "classical solution to equations of motion with a finite, non-zero action" and further specifies that it is "on a Euclidean spacetime"
  • Newest instantons Questions - Physics Stack Exchange
    An instanton (pseudoparticle) is a classical solution to the equations of motion, usually of Yang-Mills theory, with a finite, non-zero action, on a Euclidean spacetime Instantons normally dominate the path integral of Y-M theory and determine its quantum tunneling behavior May use for merons and other topological field-theoretic configurations
  • mathematical physics - What, to a physicist, are instantons and the . . .
    I study gauge theory from a mathematical perspective To me, one of the most fundamental ideas is the notion of an instanton on a 4-manifold To be precise, I have a Riemannian 4-manifold and a
  • How do instantons look in real time spacetime?
    Does it imply that instantons do not exist in real spacetime or the instanton tunneling effects does not have observable consequences in Minkowsian spacetime? How does an instanton solution "look like" in real time? In imaginary time, the instanton solution interpolates between two vacua What happens in real space?
  • Understanding instantons in pure Yang-Mills theory
    Yang-Mills Instantons are defined as finite action solutions to the corresponding Euclidean equation of motion If I understood it correct, then instantons are those classical gauge field configura
  • Euclidification of quantum field theories and instantons
    I have a question about the philosophy behind the concept of instantons So far I know (following translation from German wiki instantons are spatially and temporary localised soliton solutions in
  • Compactification and gauge choice for instanton solutions
    The instanton solutions are classical solutions of the Euclidean Yang-Mills equations that have a finite and non-zero action They can be interpreted as tunneling events between different vacua of the theory, which are labeled by the Chern-Simons number, a topological invariant
  • How do instantons cause vacuum decay? - Physics Stack Exchange
    From what I read about on instantons (Zee, QFT in a Nutshell, pg 309-310), an instanton is a vacuum solution that maps $S^3 \rightarrow S^3$ (the boundary of Euclideanized spacetime), which comes from minimizing the Euclidean action for some Lagrangian with a nontrivial vacuum structure
  • quantum mechanics - Understanding multiple instanton contributions to . . .
    Coleman then introduces other "approximate stationary points" which are effectively instanton antiinstanton chains which start at one vacuum and end at the other Coleman then continues in his analysis by adding up all of these approximate stationary point contributions to the original single instanton stationary point term My question is the following: in what sense are these multiple





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