2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34106The brane world based on the 6D gravitational model is examined. It is regarded as a higher dimensional version of the 5D model by Randall and Sundrum >. The obtained analytic solution is checked by the numerical method. The mass hierarchy is examined. Especially the {\it geometrical see-saw} mass relation, between the Planck mass, the cosmological constant, and the neutrino mass, is suggested. Comparison with the 5D model is made.5 pages, 4 figures, Proceedings of the 5th RESCUE Int. Symp. on "New Trends in Theoretical and Observational Cosmology"General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext