2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/184412The holographic interpretation is a useful tool to describe 5D field theories in a 4D language. In particular it allows one to relate 5D AdS theories with 4D CFTs. We elaborate on the 5D/4D dictionary for the case of fermions in AdS$_5$ with boundaries. This dictionary is quite useful to address phenomenological issues in a very simple manner, as we show by giving some examples.22 pages, 2 figures; v2: minor corrections, references addedHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext