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CRPropa Workshop 2023

Sep 25 – 27, 2023
Ruhr University Bochum
Europe/Berlin timezone

Contribution List

24 / 24
19. Introduction Talk
Julien Dörner (TP IV RUB), Lukas Merten
9/25/23, 9:00 AM
1. CRPropa simulations for anisotropy studies
Simone Rossoni
9/25/23, 9:30 AM

Currently, there is growing evidence of an anisotropic component in the Ultra-High-Energy Cosmic Ray (UHECR) sky with energy greater then a few EeV. However, identifying cosmic accelerators capable of reaching such high energies remains challenging due to interactions with background photons and magnetic deflection caused by cosmic fields (both galactic and extragalactic). Additionally, the...
13. Impact of a ΛCDM extension on UHECR propagation
Janning Meinert
9/25/23, 10:00 AM

The existing discrepancies between the observation of local and extraction of global cosmological parameters are driving the need for an extension of the ΛCDM cosmological model. A proposed extension called SU(2)CMB describes cosmic microwave background (CMB) photons with an SU(2) instead of a U(1) gauge group. This reduces some of these tensions (such as H0, Ω𝑚, 𝜎8), pushes the recombination...
3. Normalizing Flows for Parameter Estimation of UHECR Sources with Surface Detector Data of the Pierre Auger Observatory
Frederik Krieger
9/25/23, 11:00 AM

The combined fit of the energy spectrum and shower maximum depth distributions of ultra-high-energy cosmic rays, as measured at the Pierre Auger Observatory, can yield constraints on source parameters. These parameters include the maximum rigidity, the spectral index of the injected energy spectrum, and the initial mass composition. The relationship between the observables measured at Earth...
12. Population studies of UHECR sources
Domenik Ehlert
9/25/23, 11:30 AM

A key question in the field of UHECR physics is whether the observed flux is produced by a few prominent local sources or a large population of sources with similar contributions to the total flux. We constrain the ensemble of sources by investigating how diverse sources can be in terms of the maximum cosmic ray rigidity while remaining compatible with observations. We additionally study if...
14. Combined fit of UHECRs with jetted AGN
Pavlo Plotko (DESY)
9/25/23, 12:00 PM

We present a detailed study of the contribution of low- and high-luminosity jetted Active Galactic Nuclei (AGN) populations to the spectrum and composition of ultra-high-energy cosmic rays (UHECRs) and the corresponding EeV neutrino flux. We find that two AGN populations should have different properties to explain the UHECR data. Our results show that the dominant contribution to the neutrino...
24. Towards SimProp-Sirente: the new release of the SimProp code
Carmelo Evoli
9/25/23, 2:30 PM

In my talk I will show the new advancements in SimProp development.
8. Hadronic Interactions in CRPropa
Julien Dörner (TP IV RUB)
9/25/23, 4:00 PM

The most relevant energy loss channel for Galactic Cosmic rays (GCRs) are the interactions with the ambient gas called hadronic interactions (HI). These interactions produce gamma-rays in the very high energy band as well as neutrinos and secondary leptons, hence establishing a connection between these messengers as observed on Earth. This is especially relevant with the recent observation of...
9. Simulating UHECR sources with CRPropa using updated interaction modules
Leonel Morejon
9/25/23, 4:30 PM

The study of the origin of Ultra-High-Energy Cosmic Rays (UHECRs) involves understanding how they interact and escape the sources. The escape is determined by the magnetic fields and the acceleration at the source, whereas the composition is affected by interactions which also lead to very high energy photons and neutrinos. CRPropa is well suited for studying these scenarios with the addition...
18. Time dependent particle injection to investigate the local source behaviour of flaring AGN
Mr Leander Schlegel (Ruhr-Universität Bochum)
9/26/23, 9:00 AM

Since their discovery over a century ago, the origin of cosmic rays of the highest energies is still widely uncertain. A promising class of potential sources are Active Galactic Nuclei (AGN), that appear in quiescent and flaring states. To numerically modelate their local-source behaviour in detail, in foregoing work the software CRPropa was extended, to be able to capture the jet-physics on...
20. Synchrotron radiation in CRPropa
Athithya Aravinthan, Jonas Hellrung, Julien Dörner (TP IV RUB), Lukas Merten
9/26/23, 9:30 AM
2. On numerical Simulations of Intergalactic Electromagnetic Cascades with Lorentz Invariance Violation Using CRPropa
Andrey Saveliev
9/26/23, 10:00 AM

Lorentz invariance violation (LIV) is a proposed phenomenon where Lorentz symmetry is violated at high energies, potentially affecting particle dynamics and interactions. We use numerical simulations with the CRPropa framework to investigate LIV in gamma-ray-induced electromagnetic cascades, specifically studying how it impacts cascading electrons and photons undergoing pair production and...
6. Coupling axion-like particles to photons during propagation: the ALPinist plug-in
Rafael Alves Batista
9/26/23, 11:00 AM

Axion-like particles (ALPs) are hypothetical entities often invoked to solve various problems in particle physics and cosmology. They are one of the most promising candidates to explain the elusive dark matter. A way to search for ALPs is through their effects on photons. In the presence of external magnetic fields, ALPs and photons can convert into one another, leading to measurable signals....
7. Characterisation of gamma-ray propagation in our Galaxy
Gaetano Di Marco
9/26/23, 11:30 AM

Motivated by recent observations of Galactic TeV gamma-ray sources and their uncertain origins, we investigate the propagation of gamma rays in our Galaxy.
TeV and PeV gamma rays produce electron-positron pairs over Galactic length scales due to interactions with background radiation fields, i.e. Cosmic Microwave Background (CMB) and Intra Stellar Radiation Field (ISRF). The highly energetic...
21. Probing the intergalactic magnetic field through gamma-ray observations
Paolo Da Vela
9/26/23, 2:00 PM

The origin of magnetic fields in galaxies and clusters of galaxies are generally explained via amplification mechanisms of weak seed fields. However, the nature of these seeds is still unknown. Two different hypotheses exist: the astrophysical and the cosmological origins. In the latter case a residual magnetic field is expected in the cosmic voids. For this reason it is crucial to look for...
16. Very-high-energy gamma ray propagation with CRPropa, CRbeam and ELMAG
Alexander Korochkin
9/26/23, 3:00 PM

We asses the precision of the modeling of electromagnetic cascades using model calculations with publicly available Monte-Carlo codes CRPropa, CRbeam and ELMAG and compare their predictions with theoretical expectations. We find that model predictions of different codes differ by up to 50% for low-redshift sources, with discrepancies increasing up to order-of-magnitude level with the...
10. Influence of plasma instabilities on the propagation and spectrum of extragalactic electromagnetic cascades
Luis Enrique Espinosa Castro
9/26/23, 4:00 PM

The role of plasma instabilities in the development of electromagnetic cascades from extragalactic sources has gained importance as an alternative theory that seeks to explain the deviation of observed photon flux results from theoretical predictions at the GeV scale. This phenomenon is the result of the interaction between electron-positron pairs with the intergalactic medium (IGM). The...
11. Local Source Physics with CRPropa - Extending Test Particle Simulations for Modelling Leptohadronic AGN Jets
Marcel Schroller
9/26/23, 4:30 PM

Active galactic nuclei (AGN) and the accompanying jets are candidates for the engine of ultra-high-energy cosmic rays, gamma rays, and neutrinos. In 2017, IceCube observed an extragalactic high-energy neutrino event with a strong hint of a directional coincidence with the position of a known jetted AGN TXS0506+056. A deep understanding of the processes related to jets will fuel the field of...
5. Ensemble Averaged Transport with CRPropa
Lukas Merten
9/27/23, 9:00 AM

Ensemble averaged transport modelling has become one of the key ingredients in the CRPropa framework. It is nowadays used to describe the propagation of Galactic cosmic rays, simulate the spatial transport in sources or to test analytical predictions of particle acceleration.

CRPropa’s DiffusionSDE module was originally developed as a low energy extension of the existing ultra-high energy...
23. Diffusion of Energetic Particles in Turbulent Magnetic Fields
Horst Fichtner
9/27/23, 9:30 AM

Spatial and momentum diffusion are important transport processes for
energetic particles in various astrophysical environments. A lot has been
learned from studying the transport conditions in the heliosphere, where
in-situ measurements provide comparatively detailed insights. In the talk
different approaches to quantitatively describe these processes and how
to test the corresponding...
22. Investigating Charged Particle Transport in Non-Gaussian Magnetic Turbulence Models
Frederic Effenberger
9/27/23, 10:00 AM

Quasilinear theory has dominated the description of charged particle transport in magnetic turbulence since the 1960s.
While it leads to important insights, one should keep in mind that it characterizes the turbulent magnetic field solely
by the power spectrum, which has lead to a wide range of models describing the magnetic field by a simple self-similar
random field with a prescribed...
15. The Galactic diffuse gamma-ray and neutrino emission at the PeV frontier
Pedro De la Torre Luque (Oskar Klein Centre, Stockholm University)
9/27/23, 11:00 AM

The LHAASO collaboration recently reported a robust measurement of the diffuse gamma-ray emission from the Galactic plane at energies from $\sim10$~TeV up to the PeV. This observation represents a clear evidence of a higher diffuse gamma-ray flux from the Galaxy than the expected from traditional models of CR interactions.
On top of this, the recent detection of neutrinos from the Galactic...
4. Modeling Superdiffusive Particle Transport with CRPropa3.2
Sophie Aerdker
9/27/23, 11:30 AM

In the heliosphere, power laws in space and time profiles of energetic particles are observed. It has been proposed that they result from superdiffusive transport. Such anomalous, non-Gaussian, transport regimes may arise as consequence of intermittent magnetic field structures.

Superdiffusive particle transport can be described by a space-fractional Fokker-Planck equation. Numerical...
17. The IMAGINE magnetic field library
Sebastian Hutschenreuter (University of Vienna)
9/27/23, 2:00 PM

The IMAGINE Consortium aims to coordinate and facilitate research in the broad areas of the interstellar medium (ISM), in particular the Galactic magnetic field and cosmic rays. Our goal is to develop more comprehensive insights into the structures and roles of interstellar magnetic fields and their interactions with cosmic rays. One of the backbones of the consortium is a model library, which...