1/16-BPS black holes and giant gravitons in the AdS5 x S5 space

We explore 1/16- BPS objects of type IIB string theory in AdS(5) x S-5. First, we consider supersymmetric AdS(5) black holes, which should be 1/16 - BPS and have a characteristic that not all physical charges are independent. We point out that the Bekenstein-Hawking entropy of these black holes admits a remarkably simple expression in terms of ( dependent) physical charges, which suggests its microscopic origin via certain Cardy or Hardy-Ramanujan formula. We also note that there is an upper bound for the angular momenta given by the electric charges. Second, we construct a class of 1/16 - BPS giant graviton solutions in AdS(5) x S-5 and explore their properties. The solutions are given by the intersections of AdS(5) x S-5 and complex 3 dimensional holomorphic hyperspaces in C1+5, the latter being the zero loci of three holomorphic functions which are homogeneous with suitable weights on coordinates. We investigate examples of giant gravitons, including their degenerations to tensionless strings.