A5057919060- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Geophysics and Sensor Technology
Leibniz University Hannover
2020-2024
Max Planck Institute for Gravitational Physics
2020-2024
Deutsches Elektronen-Synchrotron DESY
2016-2021
Institute for Cosmic Ray Research
2021
University of L'Aquila
2021
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2021
Kavli Institute for the Physics and Mathematics of the Universe
2021
University of Zagreb
2021
The Ohio State University
2017
We demonstrate that a population of Active Galactic Nuclei (AGN) can describe the observed spectrum ultra-high-energy cosmic rays (UHECRs) at and above ankle, dominant contribution comes from low-luminosity BL Lacs. An additional, subdominant high-luminosity AGN is needed to improve description composition observables, leading substantial neutrino flux peaks EeV energies. also find different properties for low- populations are required; possibly similar baryonic loading already be excluded...
ABSTRACT The origin and composition of ultra-high-energy cosmic rays (UHECRs) remain a mystery. proton dip model describes their spectral shape in the energy range above 10 9 GeV by pair production photohadronic interactions with microwave background. also produce cosmogenic neutrinos peaking around GeV. We test whether this is still viable light recent UHECR spectrum measurements from Telescope Array experiment upper limits on neutrino flux IceCube. While two-parameter fits have been...
Abstract We study the implications of ultrahigh-energy cosmic-ray (UHECR) data from Pierre Auger Observatory for potential accelerator candidates and cosmogenic neutrino fluxes different combinations nuclear disintegration air-shower models. exploit most recent spectral mass composition (2017) with a new, computationally efficient simulation code, P ri NC e . extend systematic framework, which has been previously applied in combined fit by Collaboration, cosmological source evolution as an...
Abstract Gamma-ray bursts (GRBs) are promising as sources of neutrinos and cosmic rays. In the internal shock scenario, blobs plasma emitted from a central engine collide within relativistic jet form shocks, leading to particle acceleration emission. Motivated by present experimental constraints sensitivities, we improve predictions emission investigating time-dependent effects multiple shocks. We produce synthetic light curves with different variability timescales that stem properties...
We compute the expected neutrino fluence from SGRB 170817A, associated with gravitational wave event GW 170817, directly based on Fermi observations in two scenarios: structured jet and off-axis (observed) top-hat jet. While for case is very small, large angles imply high radiation densities jet, which can enhance production efficiency. In most optimistic allowed scenario, reach only 10−4 of sensitivity telescopes. furthermore demonstrate that fact gamma-rays escape limits baryonic loading...
We scrutinize the paradigm that conventional long-duration Gamma-Ray Bursts (GRBs) are dominant source of ultra-high energy cosmic rays (UHECRs) within internal shock scenario by describing UHECR spectrum and composition studying predicted (source cosmogenic) neutrino fluxes. Since it has been demonstrated stacking searches for astrophysical GRB neutrinos strongly constrain parameter space in single-zone models, we focus on dynamics multiple collisions which different messengers expected to...
We discuss the production of multiple astrophysical messengers (neutrinos, cosmic rays, gamma-rays) in Gamma-Ray Burst (GRB) internal shock scenario, focusing on impact collision dynamics between two shells fireball evolution. In addition to inelastic case, which plasma merge when they collide, we study Ultra Efficient Shock a fraction energy is re-converted into kinetic and, consequently, survive and remain system. find that all cases quasi-diffuse neutrino flux from GRBs at level...
The origin and composition of ultra-high-energy cosmic rays (UHECRs) remain a mystery. proton dip model describes the shape ray spectrum above $10^9$ GeV by effect pure propagating through microwave background. In these interactions secondary neutrinos are produced. We fit recent UHECR measurements from Telescope Array experiment under assumption composition, as assumed model. present full scan three main physical parameters UHECR-injection: source redshift evolution, injected maximal energy...
For a long time Gamma-Ray Bursts (GRBs) have been discussed as potential origin of Ultra-High-Energy Cosmic Rays (UHECRs). This paradigm is challenged by the lack High-Energy (HE) neutrinos detected IceCube that could be associated with known GRBs. In this work, we study two scenarios reconcile GRBs UHECR sources: First fit spectrum and \xmax observed Auger conventional long-duration in multi-zone internal shock model. Here, systematically scan over different engine realisations may...
The origin of Ultra-High Energy Cosmic Rays (UHECRs) is still unknown. Gamma-Ray Bursts (GRBs) are considered as potential sources they belong to the most energetic events observed date. However, conventional GRB scenarios strongly constrained by non-observation associated astrophysical neutrinos. On other hand, hidden accelerators such low-luminosity GRBs (LLGRBs) can ameliorate constraints. We show that population LLGRBs not only consistent with current constraints, but even describe UHECR...
We study the implications of Ultra-High Energy Cosmic Ray (UHECR) data from Pierre Auger Observatory for potential accelerator candidates and cosmogenic neutrino fluxes combinations nuclear disintegration air-shower models. exploit most recently published spectral mass composition (2017) with a new, computationally efficient simulation code PriNCe. extend systematic framework, which has been previously applied in combined fit by Collaboration, cosmological source evolution as an additional...