Hans-Christoph Thomas

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We study, both classically and quantum-mechanically, the problem of a neutral particle with a spin S, mass m and magnetic moment µ, moving in one dimension in an inhomogeneous magnetic field given by B = B 0 ˆ z+B ′ ⊥ xˆy. This problem serves for us as a toy model to study the trapping of neutral particles. We identify K ≡ S 2 (B ′ ⊥) 2 µmB 3 0 , which is(More)
Recently, we developed a method for calculating the lifetime of the particle in the special situation where there is no potential barrier, as a first step in our efforts to understand the quantum-mechanics of magnetic traps. The toy model that was used in this study was physically unrealistic because the magnetic field did not obey Laplace's equation. Here,(More)
We report the discovery and analysis of the follow-up ROSAT pointed observation, an ASCA observation and optical and radio observations of the enigmatic Narrow-Line Seyfert 1 galaxy RX J0134.2–4258. While its spectrum was one of the softest observed from an AGN during the ROSAT All-Sky Survey, its spectrum was found to be dramatically harder during a(More)
We study, both classically and quantum-mechanically, the problem of a neutral particle with spin S, mass m and magnetic moment µ, moving in two-dimensions in an inhomogeneous magnetic field given by B = B ′ ⊥ (xˆx − yˆy) + B 0 ˆ z. We identify K ≡ S 2 (B ′ ⊥) 2 µmB 3 0 , which is the ratio between the precessional frequency of the particle and its vibration(More)
We investigate the time evolution of stochastic non-Markov processes as they occur in the coarse-grained description of open and closed systems. We show that semigroups of propagators exist for all multivariate probability distributions, the generators of which yield a set of time-convolutionless master equations. We discuss the calculation of averages and(More)
Recently, we developed a method for calculating the lifetime of a particle inside a magnetic trap with respect to spin flips, as a first step in our efforts to understand the quantum-mechanics of magnetic traps. The 1D toy model that was used in this study was physically unrealis-tic because the magnetic field was not curl-free. Here, we study, both(More)