High Energy Multi-Messenger Astrophysics: Latest Research and Reviews

Dear Colleagues,

Cosmic rays (CRs) bring information about the surrounding universe, our Galaxy, and also extragalactic space, at least at the highest observed energies. They represent one of the most important energy transformation processes in the Universe. Understanding their origin and propagation through the interstellar medium (ISM) is a fundamental problem that has a major impact on models of the structure and nature of the Universe. Charged cosmic rays, gammas, and neutrinos are strongly correlated with CR sources where hadronic accelerators are at work. Their integrated study is one of the most important and exciting fields in 'multi-messenger astrophysics'; the exploration of the Universe that combines information from different cosmic messengers, such as electromagnetic radiation, gravitational waves, neutrinos, and cosmic rays.

After the discovery of TeV-emitting gamma-ray sources and the evidence of high-energy neutrinos of cosmic origin, a real breakthrough occurred in 2016 with the first observation of gravitational waves (GWs). High-energy astrophysics is now studied using at least three experimental branches: the electromagnetic radiation, from radio to X-rays; charged CRs, gamma-rays and neutrinos, detected with experimental methods developed in particle physics; and GWs, observed using laser interferometers. The combined study of the Universe with all the aforementioned probes offers unique opportunities, as demonstrated by the observation of the merging of two neutron stars in 2017. The observation of a GW and a GRB was quickly followed by the most extensive worldwide observational campaign using about 70 observatories on all continents and in space.

In this Special Issue, we invite the submission of papers exploring the development of multi-messenger and multi-wavelength approaches. Contributions can focus on the latest research and results regarding measurements and modeling in CR physics, gamma-ray astronomy, and neutrino astronomy with correlations with gravitational wave observation. Survey papers and reviews are also welcome.

Dr. Giuseppe Di Sciascio
Guest Editor

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