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We propose a possible resolution to the cosmological constant problem througha scenario in which the universe is composed of three components: matter,radiation (CMB) and vacuum energy such that vacuum energy is not constant andis decaying into the matter component. Matter in this scenario consists ofbaryonic matter and primordial black holes (PBHs) as the dark matter. Localequilibrium condition between PBHs and CMB confines the mass and the radius ofPBHs. The mechanism accounting for the decaying process is nothing but theabsorption of vacuum energy modes by the PBHs up to a wavelength of the orderof their radius. Acting as a natural cut-off on the wavelength of vacuum energymodes, this leads to the observed value for the vacuum energy density.

Primordial black holes, zero-point energy and the CMB: The cosmic connection