English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The electron and positron cosmic rays puzzle has triggered a revolution inthe field of astroparticle physics. Many hypotheses have been proposed toexplain the unexpected rise of the positron fraction, observed by HEAT andPAMELA experiments, for energies larger than few GeVs. In this work, we studysources of positron cosmic rays related to annihilation of dark matter andsecondary production. In both cases, we consider the impact of uncertaintiesrelated to dark matter physics, nuclear physics and propagation of cosmic rays,finding that the largest uncertainties come from propagation. We find that somekey features present in the positron signal from dark matter annihilation arepreserved even though the uncertainties. In addition, we study the stability ofthe positron fraction under small variations of the electron flux, which isusually considered as known, we found that considering just the observationaluncertainties in the electron flux is enough to changed dramatically thepositron fraction in the energy range were the excess is observed.

Positrons from cosmic rays interactions and dark matter annihilations