  In the Randall-Sundrum model, we study top-antitop pair production and top
spin correlations at the Large Hadron Collider. In addition to the Standard
Model processes, there is a new contribution to the top-antitop pair production
process mediated by graviton Kaluza-Klein modes in the s-channel. We calculate
the density matrix for the top-antitop pair production including the new
contribution. With a reasonable parameter choice in the Randall-Sundrum model,
we find a sizable deviation of the top-antitop pair production cross section
and the top spin correlations from those in the Standard Model. In particular,
resonant productions of the graviton Kaluza-Klein modes give rise to a
remarkable enhancement of such a deviation.
