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582 papers · 1 filter
Geometric Analysis and General Relativity
Lars Andersson
This article discusses methods of geometric analysis in general relativity, with special focus on the role of "critical surfaces" such as minimal surfaces, marginal surface, maxima…
Fast electronic relaxation in metal nanoclusters via excitation of coherent shape deformations: Circumventing a bottleneck
Vitaly V. Kresin, Yu. N. Ovchinnikov
Electron-phonon relaxation in size-quantized systems may become inhibited when the spacing of discrete electron energy levels exceeds the magnitude of the phonon frequency. We show…
First Measurement of Charged Current Cross Sections at HERA with Longitudinally Polarised Positrons
H1 Collaboration
Data taken with positrons of different longitudinal polarisation states in collision with unpolarised protons at HERA are used to measure the total cross sections of the charged cu…
High brightness temperatures and circular polarisation in extra-galactic radio sources
J. G. Kirk, O. Tsang
Some rapidly variable extra-galactic radio sources show very high brightness temperatures T_B>10^{12}K and high degrees of circular polarisation (1%). Standard synchrotron models t…
PMAS: The Potsdam Multi Aperture Spectrophotometer. II. The Wide Integral Field Unit PPak
Andreas Kelz, Marc A. W. Verheijen, Martin M. Roth +6
PPak is a new fiber-based Integral Field Unit (IFU), developed at the Astrophysical Institute Potsdam, implemented as a module into the existing PMAS spectrograph. The purpose of P…
Quasiquartet CEF ground state with possible quadrupolar ordering in the tetragonal compound YbRuGe
H. S. Jeevan, Z. Hossain, C. Geibel
e have investigated the magnetic properties of YbRuGe by means of magnetic susceptibility (T), specific heat C(T) and electrical resistivity (T) measurements perf…