Cosmic Rays and Astroparticle Physics

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Space Science".

Deadline for manuscript submissions: 30 November 2026 | Viewed by 532

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Guest Editor
Laboratoire Univers et Particules de Montpellier, Université de Montpellier, cc072, 34095 Montpellier, France
Interests: high-energy (X- and gamma-ray) astrophysics; radiative transfer and particle acceleration in compact objects (jets and accretion disc coronae); radiative transfer in special and general relativity; cosmic-ray research (the sources of cosmic rays, the propagation of cosmic rays in the interstellar medium, magneto-hydrodynamic turbulence in the interstellar medium)

Special Issue Information

Dear Colleagues,

Cosmic rays are not merely a collection of particles traveling through the cosmos to Earth. It is an essential component of the dynamical evolution of structures in the Universe, from the first stars to our Galaxy. Their acceleration, transport, and interaction with the interstellar and circumgalactic media shape a wide range of space environments and can influence multi-messenger observations.

However, their origin and modes of propagation from their sources to our detectors require substantial improvements—and in some cases revisions—of the paradigms established in the 1960s and 1970s. Understanding these processes in realistic astrophysical environments is essential for interpreting current and future ground and space-borne measurements.

In this Special Issue, particular attention will be given to recent analytical and numerical work that contributes to these theoretical developments. The entire field of cosmic-ray research may be addressed, from the highest energies down to supra-thermal energies, from processes associated with high-energy multi-messenger radiation to the issues of ionization and heating of the interstellar medium. Studies that connect theoretical or microphysical processes to observable consequences in space environments are particularly welcome.

Particular attention will be given to work that links microphysical mechanisms to their macroscopic impact on Galactic ecology, star-formation feedback, and the structure of the interstellar and circumgalactic media, as well as to contributions that make use of or are relevant for space-borne or ground-based observations.

Dr. Alexandre Marcowith
Guest Editor

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Keywords

  • cosmic rays
  • high-energy astrophysics
  • turbulence
  • kinetic and first principles physics
  • acceleration and transport processes

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Published Papers (1 paper)

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Research

16 pages, 432 KB  
Article
Geometric Properties of the Lightlike Biharmonic Curves in 3D pp-Wave Space
by Jianguo Sun, Danhong Chen and Lunan Wang
Universe 2026, 12(6), 166; https://doi.org/10.3390/universe12060166 - 3 Jun 2026
Viewed by 274
Abstract
In this article, we explore the geometric properties of the trajectory of biharmonic particles modeled as lightlike biharmonic curves in 3D pp-wave space. Using the Levi–Civita connection and curvature tensor, we derive conditions for the geometric invariant torsion of the lightlike proper biharmonic [...] Read more.
In this article, we explore the geometric properties of the trajectory of biharmonic particles modeled as lightlike biharmonic curves in 3D pp-wave space. Using the Levi–Civita connection and curvature tensor, we derive conditions for the geometric invariant torsion of the lightlike proper biharmonic curves and establish transformation relationships between general helices and lightlike Killing magnetic curves. We also provide formulas for developable surfaces generated by these curves and include illustrative examples. Full article
(This article belongs to the Special Issue Cosmic Rays and Astroparticle Physics)
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