Large extra dimension effects on the spin configuration of the top quark pair
at the e+e−→ttˉ process are studied. It is shown that the TeV
scale quantum gravity effects cause significant deviations from the Standard
Model predictions for the spin configuration in the off-diagonal basis: they
lead to substantial cross sections of the like-spin states of the top quark
pair, which vanish in the SM; they weaken the pure dominance of the processes,
the Up-Down (Down-Up) spin states for the left-handed (right-handed) beam. In
addition it is shown that the angular cut −0.5<cosθ<0 is very effective
to determine the sign of the quantum gravity corrections.Comment: A discussion on the angular distribution is added with a tabl