Abstract
We study the sensitivity reach of 0.5−2 TeV e+e− linear colliders in the context of the ADD model, in which gravity becomes strong at TeV scale. We include the real emission channel e+e−→γG, as well as the virtual-graviton-exchange channels e+e−→γγ,qq¯,μ+μ−,τ+τ−,e+e−. Assuming no excess of events over the standard model predictions, we obtain the lower 95% C.L. limits on the effective Planck scale. These limits are better than those obtained in the Run II's of the Tevatron and comparable to those of the LHC