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Abstract: A gauge-invariant saddle point expansion for the Yang-Mills vacuum transitionamplitude on the basis of the squeezed approximation to the vacuum wavefunctional is outlined. This framework allows the identification ofgauge-invariant infrared degrees of freedom which arise as dominant sets ofgauge field orbits and provide the principal input for an essentiallyanalytical treatment of soft amplitudes. The analysis of the soft modes shedsnew light on how vacuum fields organize themselves into collective excitationsand yields a gauge-invariant representation of instanton and meron effects aswell as a new physical interpretation for Faddeev-Niemi knots.



Autor: Hilmar Forkel

Fuente: https://arxiv.org/



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