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In this paper, we investigate the structures of galaxies which either have orhave had three BHs using $N$-body simulations, and compare them with those ofgalaxies with binary BHs. We found that the cusp region of a galaxy which have(or had) triple BHs is significantly larger and less dense than that of agalaxy with binary BHs of the same mass. Moreover, the size of the cusp regiondepends strongly on the evolution history of triple BHs, while in the case ofbinary BHs, the size of the cusp is determined by the mass of the BHs. Ingalaxies which have (or had) three BHs, there is a region with significantradial velocity anisotropy, while such a region is not observed in galaxieswith binary BH. These differences come from the fact that with triple BHs theenergy deposit to the central region of the galaxy can be much larger due tomultiple binary-single BH scatterings. Our result suggests that we candiscriminate between galaxies which experienced triple BH interactions withthose which did not, through the observable signatures such as the cusp sizeand velocity anisotropy.

Evolution of Massive Blackhole Triples II -- The effect of the BH triples dynamics on the structure of the galactic nuclear