/ 98 05 11 8 v 2 1 7 Ju l 1 99 8 DFUB 98 - 5 TP - USL / 98 / 4 May 1998 The Master Differential Equations for the 2 - loop Sunrise

8 v 1 1 9 M ay 1 99 8 DFUB 98 - 5 TP - USL / 98 / 4 May 1998 The Master Differential Equations for the 2 - loop Sunrise

The master differential equations in the external square momentum p2 for the master integrals of the two-loop sunrise graph, in n-continuous dimensions and for arbitrary values of the internal masses, are derived. The equations are then used for working out the values at p2 = 0 and the expansions in p2 at p2 = 0, in (n− 4) at n → 4 limit and in 1/p2 for large values of p2. ——————————PACS 11.10....

98 05 03 6 v 2 7 M ay 1 99 8 Theoretical aspects of roAp stars

/ 98 07 15 7 v 1 2 1 Ju l 1 99 8 Generalized Coordinate Gauge , Nonabelian Stokes Theorem and the Dual QCD Lagrangian

This is an extended version of the paper hep-th/9802134. Dual QCD Lagrangian is derived by making use of the coordinate gauge of general type where the 1-form (vector potential) is expressed as a contour integral of the 2-form (field strength) along an (arbitrary) contour C. As another application a simple proof of the nonabelian Stokes theorem is given.

ar X iv : a st ro - p h / 98 06 05 4 v 1 3 J un 1 99 8 2 . 5 – 11 . 6 μ spectrophotometry and imaging of the CfA sample

We present low resolution spectrophotometric and imaging ISO observations of a sample of 54 AGN's over the 2.5–11 µ range. The observations generally support unification schemes and set new constraints on models of the molecular torus.

ar X iv : h ep - l at / 9 80 70 22 v 1 1 0 Ju l 1 99 8 DESY 98 - 088 String breaking in SU ( 2 ) gauge theory with scalar matter fields

We investigate the static potential in the confinement phase of the SU(2) Higgs model on the lattice, where this model is expected to have properties similar to QCD. We observe that Wilson loops are inadequate to determine the potential at large distances, where the formation of two color-neutral mesons is expected. Introducing smeared fields and a suitable matrix correlation function, we are a...