ar X iv : g r - qc / 0 11 20 07 v 1 7 D ec 2 00 1 Report on A 5 . Computer Methods

ar X iv : g r - qc / 0 11 20 12 v 1 7 D ec 2 00 1 RELATIVISTIC GRAVITY WITH A DYNAMICAL PREFERRED FRAME

ar X iv : g r - qc / 0 31 20 38 v 1 7 D ec 2 00 3 Strings and Branes under Microscope

It is shown that in the standard vacuum 5D Kaluza-Klein gravity there is a wormhole-like solution which look like a string attached to two D-branes. The asymptotical behaviour of the corresponding metric is investigated.

ar X iv : g r - qc / 0 51 20 76 v 1 1 3 D ec 2 00 5 Group averaging , positive definiteness and superselection sectors 1

I discuss group averaging as a method for quantising constrained systems whose gauge group is a noncompact Lie group. Focussing on three case studies, I address the convergence of the averaging, possible indefiniteness of the prospective physical inner product and the emergence of superselection sectors.

ar X iv : g r - qc / 0 11 01 18 v 1 2 7 O ct 2 00 1 Constancy of the Constants of Nature 1

The current observational and experimental limits on time variation of the constants of Nature are briefly reviewed.

ar X iv : h ep - l at / 0 01 20 10 v 1 7 D ec 2 00 0 1 The Vacuum Polarization : Power Corrections beyond OPE ? ∗

X iv :h ep -l at /0 01 20 10 v1 7 D ec 2 00 0 1 The Vacuum Polarization: Power Corrections beyond OPE ? ∗ M. Göckeler, R. Horsley, W. Kürzinger, V. Linke, D. Pleiter, P. E. L. Rakow and G. Schierholz Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany Deutsches Elektronen-Synchrotron DESY & NIC, D-15735 Zeuthen, Germany Institut für Physik, Humboldt-Universität...