Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Postersitzung

HK 34.63: Poster

Thursday, March 13, 2008, 14:00–16:00, Poster C3

Gauge-invariant soft modes of Yang-Mills Theory — •Hilmar Forkel — ITA, Sao Paulo, Brazil — Institut fuer Theoretische Physik, Uni Heidelberg

We introduce a gauge-invariant saddle point expansion for the Yang-Mills vacuum transition amplitude on the basis of the squeezed approximation to the vacuum wave functional. This framework allows for the identification of gauge-invariant infrared degrees of freedom which arise as dominant sets of gauge field orbits and provide the principal input for an essentially analytical treatment of soft amplitudes. The analysis of the soft modes sheds new light on how vacuum fields organize themselves into collective excitations and yields a gauge-invariant representation of instanton and meron effects as well as a new physical interpretation for Faddeev-Niemi knots. The role of the new IR degrees of freedom in the physics of the Yang-Mills vacuum will be discussed.