8 papers
Compton Scattering off Nucleons: Focus on the Nucleonic Low-Energy Degrees of Freedom
Harald W. Griesshammer
In this sketch, I focus on Physics and formalism behind dynamical polarisabilities, a new tool to test and interpret quantitative predictions about the low-energy degrees of freedo…
The S Wave Pion Deuteron Scattering Length in Effective Field Theory
Bugra Borasoy, Harald W. Griesshammer
The S wave pion deuteron scattering length is presented at NLO in the Effective Field Theory formulation of the two nucleon system with perturbative pions. At this order, this obse…
The Soft R'egime in NRQCD
H. W. Griesshammer
A Lagrangean and a set of Feynman rules are presented for Non-Relativistic QCD with manifest power counting in the heavy quark velocity . A régime is identified in which energie…
Magnetic Defects Signal Failure of Abelian Projection Gauges in QCD
Harald W. Griesshammer
Magnetically charged Abelian defects are shown to arise on most compact base manifolds and in most Abelian projection gauges. They obey the Dirac quantisation condition and give ri…
Field Theory, Critical Phenomena and Interfaces
Gernot Münster, Harald Grießhammer, Dirk Lehmann
These lecture notes want to illustrate the close connection between statistical mechanics and field theory not only on the formal level, i.e. that many concepts of one area can eas…
Defects in Modified Axial Gauge QCD_{3+1}
H. W. Griesshammer
Magnetically charged vortex defects are shown to arise in canonically quantised modified axial gauge QCD_{3+1} on a torus. This gauge -- being an Abelian projection -- keeps only t…