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- Centre National de la Recherche ScientifiqueFR593 papers
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32 papers · 1 filter
Long-term optical variability of PKS 2155-304
Max A. Kastendieck, Michael C. B. Ashley, Dieter Horns
Aims: The optical variability of the blazar PKS 2155-304 is investigated to characterise the red noise behaviour at largely different time scales from 20 days to O(>10 yrs). Method…
On fixing boundary points of transitive hyperbolic graphs
Agelos Georgakopoulos, Matthias Hamann
We show that there is no 1-ended, planar, hyperbolic graph such that the stabilizer of one of its hyperbolic boundary points acts transitively on the vertices of the graph. This gi…
Hysteretic magnetoresistance and thermal bistability in a magnetic two-dimensional hole system
Ursula Wurstbauer, Cezary Śliwa, Dieter Weiss +2
Colossal negative magnetoresistance and the associated field-induced insulator-to-metal transition, the most characteristic features of magnetic semiconductors, are observed in n-t…
Counting master integrals: integration by parts vs. differential reduction
Mikhail Yu. Kalmykov, Bernd A. Kniehl
The techniques of integration by parts and differential reduction differ in the counting of master integrals. This is illustrated using as an example the two-loop sunset diagram wi…
Crossover between two different magnetization reversal modes in arrays of iron oxide nanotubes
J. Escrig, J. Bachmann, J. Jing +3
The magnetization reversal in ordered arrays of iron oxide nanotubes of 50 nm outer diameter grown by atomic layer deposition is investigated theoretically as a function of the tub…
Stability of magnetic nanoparticles inside ferromagnetic nanotubes
R. F. Neumann, M. Bahiana, J. Escrig +3
During the last years great attention has been given to the encapsulation of magnetic nanoparticles. In this work we investigated the stability of small magnetic particles inside m…