Name E_mail_Address Scientific_Session Contribution_type Title Authors_affiliations Abstract Spurzem, Rainer spurzem@ari.uni-heidelberg.de EAS Symp.6:Dynamics of Galaxies and Galactic Nuclei. oral Post-Newtonian Dynamics in Dense Stellar Systems R. Spurzem (1), D. Merritt (2), Peter Berczik (1), Ingo Berentzen (1), Miguel Preto (1), Jonathan Downing(1); 1) Astron. Rechen-Inst. Zentrum Astron. Univ. Heidelberg, Germany, 2)Rochester Inst. of Technology, Rochester, New York, USA Dense stellar systems (star clusters and galactic nuclei) are some of the most promising sources of gravitational waves since black holes may form and grow in them. In the talk I will describe how relativistic dynamics is included in $N$-body simulations of such systems, and discuss examples how we model sources in different wavelength regimes, showing results from triple and binary black holes in galactic nuclei, and giving an outlook to projected work for star clusters. Also I\'ll explain how these theoretical activities are embedded into collaborative programs with gravitational wave observatories, such as the VESF (Virgo-EGO science collaboration) and the German LISA cooperation.