  We consider Kerr-de Sitter spacetimes and evaluate their mass, angular
momentum and entropy according to the boundary counterterm prescription. We
provide a physicall interpretation for angular velocity and angular momentum at
future/past infinity. We show that the entropy of the four-dimensional Kerr-de
Sitter spacetimes is less than of pure de Sitter spacetime in agreement to the
entropic N-bound. Moreover, we show that maximal mass conjecture which states
any asymptotically de Sitter spacetime with mass greater than de Sitter has a
cosmological singularity is respected by asymptotically de Sitter spacetimes
with rotation. We furthermore consider the possibility of strengthening the
conjecture to state that any asymptotically dS spacetime will have mass greater
than dS if and only if it has a cosmological singularity and find that Kerr-de
Sitter spacetimes do not respect this stronger statement. We investigate the
behavior of the c-function for the Kerr-de Sitter spacetimes and show that it
is no longer isotropic. However an average of the c-function over the angular
variables yields a renormalization group flow in agreement with the expansion
of spacetime at future infinity.
