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38 papers · 1 filter
Analyzing X-ray variability by Linear State Space Models
Michael Koenig, Jens Timmer
In recent years, autoregressive models have had a profound impact on the description of astronomical time series as the observation of a stochastic process. These methods have adva…
GENTLE/4fan v.2.0 - A Program for the Semi-Analytic Calculation of Predictions for the Process e+e- -> 4f
D. Bardin, J. Biebel, D. Lehner +3
We describe version 2.0 of the Fortran program GENTLE/4fan for the semi-analytic computation of cross-sections and distributions in four-fermion production in e+e- annihilation. GE…
The Seyfert Galaxy NGC 6814 -- a highly variable X-ray source
Michael Koenig, Susanne Friedrich, Ruediger Staubert +1
The Seyfert galaxy NGC 6814 is a highly variable X-ray source despite the fact that it has recently been shown not to be the source of periodic variability. The 1.5 year monitoring…
Electroweak O(alpha) Corrections to W+W- Pair Production in Polarized gamma-gamma Collisions
G. Jikia
Full O(alpha) electroweak corrections for gamma-gamma-> W+W- are calculated including virtual corrections, soft and hard real photon and Z-boson emission. The corrections are quite…
Microlensing Optical Depth of the COBE Bulge
N. Bissantz, P. Englmaier, J. Binney +1
We examine the left-right asymmetry in the cleaned COBE/DIRBE near-infrared data of the inner Galaxy and show (i) that the Galactic bar is probably not seen very nearly end-on, and…
The Quantum state diffusion model and the driven damped nonlinear oscillator
M. Rigo, G. Alber, F. Mota-Furtado +1
We consider a driven damped anharmonic oscillator which classically leads to a bistable steady state and to hysteresis. The quantum counterpart for this system has an exact analyti…