What can we learn from a sharply falling positron fraction?

Abstract

Recent results from the AMS-02 data have confirmed that the cosmic ray positron fraction increases with energy between 10 and 200GeV. This quantity should not exceed 50%, and it is hence expected that it will either converge towards 50% or fall. We study the possibility that future data may show the positron fraction dropping down abruptly to the level expected with only secondary production, and forecast the implications of such a feature in term of possible injection mechanisms that include both Dark Matter and pulsars.

Proceedings to the SUGAR 2015 conference

References in corpus (14)

• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• The ATNF Pulsar Catalogue
• The cosmic-ray positron energy spectrum measured by PAMELA
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• PRISM (Polarized Radiation Imaging and Spectroscopy Mission): An Extended White Paper
• Galactic secondary positron flux at the Earth
• Probing the Pulsar Origin of the Anomalous Positron Fraction with AMS-02 and Atmospheric Cherenkov Telescopes
• Galactic electrons and positrons at the Earth:new estimate of the primary and secondary fluxes
• Inverse Compton constraints on the Dark Matter e+e- excesses
• AMS02 results support the secondary origin of cosmic ray positrons
• Discriminating the source of high-energy positrons with AMS-02
• What could we learn from a sharply falling positron fraction?