4 research outputs found
Antideuterons as a probe of primordial black holes
In most cosmological models, primordial black holes (PBHs) should have formed
in the early Universe. Their Hawking evaporation into particles could
eventually lead to the formation of antideuterium nuclei. This paper is devoted
to a first computation of this antideuteron flux. The production of these
antinuclei is studied with a simple coalescence scheme, and their propagation
in the Galaxy is treated with a well-constrained diffusion model. We compare
the resulting primary flux to the secondary background, due to the spallation
of protons on the interstellar matter. Antideuterons are shown to be a very
sensitive probe for primordial black holes in our Galaxy. The next generation
of experiments should allow investigators to significantly improve the current
upper limit, nor even provide the first evidence of the existence of
evaporating black holes.Comment: Final version, published in Astronomy & Astrophysic
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. 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 at using the latest developments on antiproton propagation models 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 emission mechanism, we derive an average upper limit of the
order of rho < 1.7E-33 g cm^-3.Comment: Accepted by A&A . Revision : clarification, results unchange