Antiprotons from primordial black holes

Primordial black holes (PBHs) have motivated many studies since it was shown that they should evaporate and produce all kinds of particles (Hawking 1974). Recent experimental measurements of cosmic rays with great accuracy, theoretical investigations on the possible formation mechanisms and detailed evaporation processes have revived the interest in such astrophysical objects. This article aims to use the latest developments in antiproton propagation models (Maurin et al. 2001; Donato et al. 2001) together with new data from BESS, CAPRICE and AMS experiments to constrain the local amount of PBH dark matter. Depending on the diffusion halo parameters and on the details of the emission mechanisms, we derive an average upper limit of the order of rho.(PBH) approximate to 1.7 x 10(-33) g cm(-3).