"Dark" systems in globular clusters: GWs emission and limits on the formation of IMBHs

Many observed globular clusters (GCs) seem to show a central overabundance of mass whose nature has not yet fully understood. Indeed, it is not clear whether it is due to a central intermediate mass black hole (IMBH) or to a massive stellar system (MSS) composed of mass segregated stars. In this contribution we present a semi-analytic approach to the problem complemented by 12 $N$-body simulations in which we followed the formation of MSSs in GCs with masses up to $3\times 10^5$ \Ms. Some implications for the formation of IMBHs and gravitational waves emission are discussed in perspective of a future work.

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