Estimating today's cosmological constant via the Zel'dovich-Holographic connection

This Letter proposes a solution of the Vacuum Energy and the Cosmological Constant (CC)paradox based on the Zel'dovich's ansatz, which states that the observable contribution to thevacuum energy density is given by the gravitational energy of virtual particle-antiparticle pairs,continually generated and annihilated in the vacuum state. The novelty of this work is the use of anultraviolet cut-off length based on the Holographic Principle, which is shown to yield current valuesof the CC in good agreement with experimental observations.