Gravireggeons and transplanckian scattering in models with one extra dimension

The inelastic scattering of the brane fields induced by $t$-channel gravireggeons exchanges in the RS model with a small curvature $\kappa$ is considered, and the imaginary part of the eikonal is analytically calculated. It is demonstrated that the results can be obtained from the corresponding formulae previously derived in the ADD model with one extra dimension of the size $R_c$ by formal replacement $R_c\to (\pi \kappa {)}^{-1}$. The inelastic cross section for the scattering of ultra-high neutrino off the nucleon is numerically estimated for the case $\kappa \ll {\bar{M}}_5\sim 1$ TeV, where ${\bar{M}}_5$ is a reduced Planck scale in five warped dimensions.