11,878 research outputs found

    The inverse spectral transform for the conservative Camassa-Holm flow with decaying initial data

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    We establish the inverse spectral transform for the conservative Camassa-Holm flow with decaying initial data. In particular, it is employed to prove existence of weak solutions for the corresponding Cauchy problem.Comment: 27 page

    On the connection between the Hilger and Radon--Nikodym derivatives

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    We show that the Hilger derivative on time scales is a special case of the Radon--Nikodym derivative with respect to the natural measure associated with every time scale. Moreover, we show that the concept of delta absolute continuity agrees with the one from measure theory in this context.Comment: 7 page

    Correlations and fluctuations of matrix elements and cross sections

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    The fluctuations and correlations of matrix elements of cross sections are investigated in open systems that are chaotic in the classical limit. The form of the correlation functions is discussed within a statistical analysis and tested in calculations for a damped quantum kicked rotator. We briefly comment on the modifications expected for systems with slowly decaying correlations, a typical feature in mixed phase spaces.Comment: 7 pages, 7 figure
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