Galactic positrons and electrons from astrophysical sources and dark matter

TL;DR

This paper investigates the origins of cosmic ray electrons and positrons, comparing astrophysical sources and dark matter, using a two-zone propagation model to analyze recent experimental data and uncertainties.

Contribution

It introduces a comprehensive analysis of cosmic ray origins considering multiple sources and propagation uncertainties within a validated two-zone model.

Findings

Dark matter annihilation can explain some positron excess

Supernova remnants contribute significantly to electron flux

Propagation uncertainties affect source contribution estimates

Abstract

A very interesting puzzle about the origin of electron and positron cosmic rays is deduced from the latests experimental results. We model the propagation of such cosmic rays in terms of a successfully tested two--zone propagation model. Several theoretical uncertainties -- like ones related to propagation -- are considered to study different types of electron and positron sources: dark matter annihilation, secondary production, and supernova remnants.