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We examine the dynamical evolution of both Plummer sphere and substructured(fractal) star forming regions in Galactic Centre (GC) strong tidal fields tosee what initial conditions could give rise to an Arches-like massive starcluster by $\sim 2$ Myr. We find that any initial distribution has to becontained within its initial tidal radius to survive, which sets a lower limitof the initial density of the Arches of $\sim$ 600 M$_\odot$ pc$^{-3}$ if theArches is at 30 pc from the GC, or $\sim$ 200 M$_\odot$ pc$^{-3}$ if the Archesis at 100 pc from the GC. Plummer spheres that survive change little other thanto dynamically mass segregate, but initially fractal distributions rapidlyerase substructure, dynamically mass segregate and by 2 Myr look extremelysimilar to initial Plummer spheres, therefore it is almost impossible todetermine the initial conditions of clusters in strong tidal fields.

The early dynamical evolution of star clusters near the Galactic Centre