\documentstyle[12pt]{article}
\pagestyle{empty}

\begin{document}
\begin{center}
{\Large \bf Correlation induced heating and cooling \\[0.5ex]
            of many-body systems}
\vspace{3ex}

{\large D.~Semkat$^a$, M.~Bonitz$^a$, D.~Kremp$^a$, M.S.~Murillo$^b$, and
        \\[0.5ex] D.O.~Gericke$^b$}
\vspace{1ex}

$^a$ Universit\"{a}t Rostock, Fachbereich
Physik, Universit\"{a}tsplatz 3,\\
D--18051 Rostock\\
$^b$ Theoretical Division, Los Alamos National Laboratory,\\
Los Alamos, New Mexico 87545
\end{center}

\vspace{5ex}

\centerline{\large Abstract}
\vspace{2ex}

Investigations of the short-time behavior of many-body systems have shown
significant deviations from kinetic energy conservation known from the
conventional kinetic theory [1,2]. On the one hand, the rapid correlation
build-up on ultrashort time scales causes an increase of kinetic energy [1,3].
On the other hand, the opposite process, i.e. cooling, could be demonstrated
in investigations of initially overcorrelated systems [2].

We analyze in detail the requirements on the initial state which lead to
heating or cooling, respectively. In particular, the cooling mechanism is of
interest for several physical systems, e.g. ions in traps [4] or ions in metal
clusters. We discuss various possibilities to prepare an overcorrelated state
and calculate quantities which can be observed in experiments such as the
temperature evolution. The predictions are confirmed by quantum kinetic and
molecular dynamics simulations.

\vspace{4ex}

\noindent [1] M. Bonitz, D. Kremp, Phys. Lett. A {\bf 212}, 83 (1996).

\noindent [2] D. Semkat, D. Kremp, and M. Bonitz,
              Phys. Rev. E {\bf 59}, 1557 (1999);

\hspace{-1ex} D. Kremp, D. Semkat, and M. Bonitz,
              in {\it Progress in Nonequilibrium

\hspace{-1.3ex} Green's Functions}, M. Bonitz (Ed.),
                World Scientific 2000, p. 34;

\hspace{-1ex} K. Morawetz
              {\it et al.},
%, M. Bonitz, V. G. Morozov, G. R\"opke, and D. Kremp, 
              Phys. Rev. E {\bf 63}, 020102 (2001).

\noindent [3] M.S.~Murillo, Phys. Rev. Lett. {\bf 87}, 1150031 (2001).

\noindent [4] M. Bonitz, D. Semkat, M.S. Murillo, and D.O. Gericke,

\hspace{-0.8ex}  poster at this workshop

\end{document}

