On the connection between Pauli-Villars and higher derivative regularizations

Institute for Nuclear Research and Nuclear Energy, Boul. Tzarigradsko Chaussee 72, 1784 Sofia, Bulgaria

Received 21 December 1997, accepted 3 February 1998

Keywords: QFT; Regularizations; BRST

Brownian motion in fluctuating periodic potentials

Institut für Theoretische Physik, Universität, Philosophenweg 19, D-69120 Heidelberg
E-Mail: cabad@ulb.ac.be, mielke@thphys.uni-heidelberg.de

Keywords: Noise induced transport; Brownian motors; Fokker-Planck equations

Fermi-liquid quasi-particles and d_x²-y²-superconductivity in the two-dimensional Hubbard model

Institut für Theoretische Physik, Universität Bremen, Postfach 330440, D-28334 Bremen

Received 16 February 1998, accepted 6 March 1998

Keywords: Fluctuation-exchange approximation; Fermi-liquid; Renormalization group acceleration

Frustration of antiferromagnetism in the t-t'-Hubbard model at weak coupling

Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universität Augsburg, D-86135 Augsburg

Received 20 February 1998, accepted 5 March 1998

Keywords: Strongly correlated electron systems; Band and itinerant models; Magnetic phase boundaries