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The short-time dynamics of correlated systems is strongly influenced by initial correlations, giving rise to an additional collision integral in the non-Markovian kinetic equation. Exact cancellation of the two integrals is found if the initial state is thermal equilibrium, which is an important consistency criterion. Analytical results are given for the… (More)

- K. Morawetz, H. S. Köhler
- 1999

The formation of correlations due to collisions in an interacting nucleonic system is investigated. Results from one-time kinetic equations are compared with the Kadanoff and Baym two-time equation with collisions included in Born approximation. A reasonable agreement is found for a proposed approximation of the memory effects by a finite duration of… (More)

Brine channels are formed in sea ice under certain constraints and represent a habitat of different microorganisms. The complex system depends on a number of various quantities as salinity, density, pH value, or temperature. Each quantity governs the process of brine channel formation. There exists a strong link between bulk salinity and the presence of… (More)

The collective motion of a finite nuclear system is investigated by numerical simulation and by linear response theory. Using a pseudo-particle simulation technique we analyze the giant resonances with a multipole decomposition scheme. We examine the energy and the damping of different giant collective modes and obtain the dependence of these quantities on… (More)

- K Morawetz, R Walke, G Roepke
- 2007

Starting from the generalized kinetic equation including complete time evolution , the memory eeect of the collision integral is calculated. It is found, that the innuence of the collisions on the time development of the distribution function is diminished by the non-Markovian behavior of the collision integrals, which is an expression of collision… (More)

- K Morawetz, G Rr Opke
- 1995

The quantum mechanical two-particle problem is considered in hot dense nuclear matter under the innuence of a strong electric eld such as the eld of the residual nucleus in heavy ion reactions. Compared with the in-medium properties in the zero-eld case, bound states are turned into resonances, and the scattering phase shifts are modiied. Three eeects are… (More)

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