• A minimal model for extragalactic high-energy particles 

      Kachelriess, Michael; Kalashev, O.; Ostapchenko, S; Semikoz, DV (Journal article; Peer reviewed, 2017)
      We explain in a unified way the experimental data on ultrahigh energy cosmic rays (UHECR) and neutrinos, using a single source class and obeying limits on the extragalactic diffuse gamma-ray background (EGRB). If UHECRs ...
    • AAfrag: Interpolation routines for Monte Carlo results on secondary production in proton–proton, proton–nucleus and nucleus–nucleus interactions 

      Kachelriess, Michael; Moskalenko, Igor V.; Ostapchenko, Sergey (Journal article; Peer reviewed, 2019)
      We provide a compilation of predictions of the QGSJET-II-04m model for the production of secondary species (photons, neutrinos, electrons, positrons, and antinucleons) that are covering a wide range of energies of the beam ...
    • Anisotropic diffusion and the cosmic ray anisotropy 

      Kachelriess, Michael (Journal article; Peer reviewed, 2019)
      We argue that the diffusion of cosmic rays in the Galactic magnetic field has to be strongly anisotropic. As a result, the number of CR sources contributing to the local CR flux is strongly reduced. The CR density is ...
    • Antideuterons as Signature for Dark Matter 

      Dal, Lars Andreas (Master thesis, 2011)
      In this thesis, we examine the antideuteron spectra from annihilations of dark matter in the form of Weakly Interacting Massive Particles (WIMPs). The so-called coalescence model is commonly used to describe the production ...
    • Antinuclei as a Signature of Dark Matter 

      Tjemsland, Jonas (Master thesis, 2019)
      Antideuteron og antihelium er blitt foreslått som en deteksjonskanal for spalting og annihilasjon av mørk materie i Melkeveien på grunn av en forventet lav astrofysisk bakgrunnstøy. I dag er det vanlig å bruke en standard ...
    • Applications of the Goldstone equivalence theorem to scattering and decay processes 

      Taule, Petter (Master thesis, 2018)
      We study applications of the Goldstone boson equivalence theorem to decay and scattering processes, exemplifying the broken gauge theory structure of electroweak interactions. Apart from interest on theoretical grounds, ...
    • Charged Particle Trajectories in the Local Superbubble 

      Andersen, Kristian Joten (Master thesis, 2017)
      In this thesis we study the propagation of cosmic rays (CR) emitted by sources in the Local Superbubble (LB). There are many bursting sources of CRs inside the LB which may be modelled as a continuous injection of CRs, and ...
    • Comparing an Analytical Cascade Spectrum of High Energy Gamma Rays to those found in a Monte Carlo simulation 

      Skrove, Martin Bromstad (Master thesis, 2014)
      In this thesis we consider the analytical model for electromagnetic cascades initiated by very high energy gamma rays due to Berezinskii. We compare the analytical prediction that the spectral energy distribution is described ...
    • Constraints from the EBL 

      Kachelriess, Michael (Journal article; Peer reviewed, 2011)
      High energy particles interacting with the extragalactic photon background initiate electromagnetic pair cascades. I discuss here the resulting constraints on UHECR models, the flux of cosmogenic neutrinos and the extragalactic ...
    • Cosmic ray models 

      Kachelriess, Michael; Semikoz, DV (Journal article, 2019)
      We review progress in high-energy cosmic ray physics focusing on recent experimental results and models developed for their interpretation. Emphasis is put on the propagation of charged cosmic rays, covering the whole range ...
    • Cosmic Rays from Pair-Instability Supernova Remnants 

      Foss, Marie Kristine (Master thesis, 2015)
      Pair-instability supernovae are the most energetic thermonuclear explosions in the Universe, up to 100 times more energetic than type Ia supernovae. Around redshift z > 6 approximately one out of ten supernovae was a ...
    • Dark Matter Contribution to the Isotropic Extragalactic Gamma-Ray Background 

      Skarshaug, Stine (Master thesis, 2011)
      This thesis looks into the possibilities of finding a signal from dark matter annihilation in the isotropic extragalactic gamma-ray background radiation (EGBR), and compares the the results with data from the Fermi Large ...
    • Diffuse CR, neutrino and gamma-ray fluxes from AGNs 

      Giacinti, Gwenael; Kachelriess, Michael; Kalashev, Oleg; Neronov, Andrei; Semikoz, Dimitry (Peer reviewed; Journal article, 2016)
      We investigate how the extragalactic proton component derived within the ’escape model’ canbe explained by astrophysical sources. We find that the complete extragalactic proton spectrumcan be explained by a single source ...
    • Escape model for Galactic cosmic rays 

      Giacinti, Gwenael; Kachelriess, Michael; Semikoz, Dimitry (Peer reviewed; Journal article, 2016)
      We show that the cosmic ray (CR) knee can be entirely explained by energy-dependent CR leak-age from the Milky Way, with an excellent fit to all existing data. We test this hypothesis cal-culating the trajectories of ...
    • Flavor Oscillations of High-Energy Neutrinos 

      Sánchez Navas, Sergio (Master thesis, 2016)
      In this thesis, we study neutrino oscillations in vacuum and in the presence of a Dark Matter halo in the Milky Way. For that purpose, first describe the particle physics of neutrinos through an historical introduction. ...
    • Gamma-ray counterpart of the IceCube neutrinos 

      Kachelriess, Michael; Neronov, Andrii Yu.; Semikoz, Dimitry V. (Journal article; Peer reviewed, 2019)
      A γ-ray excess at high Galactic latitudes starting at energies 300 GeV was recently discovered in the data of the Fermi telescope. The multi-TeV γ-ray emission found has spectral characteristics at both low and high Galactic ...
    • High energy radiation from Centaurus A 

      Kachelriess, Michael; Ostapchenko, Sergey; Tomas, R (Journal article; Peer reviewed, 2009)
      We calculate, for the nearest active galactic nucleus (AGN), Centaurus A (Cen A), the flux of high-energy cosmic rays (CR) and of accompanying secondary photons and neutrinos expected from hadronic interactions in the ...
    • Implementasjon av Tredimensjonale Elektromagnetiske Kaskader i Elmag 

      Blytt, Markus Henrikssønn (Master thesis, 2019)
      En oppdatert versjon av Monte Carlo programmet ELMAG er presentert. Programmet simulerer elektromagnetiske kaskader som startes av høyenergiske fotoner fra blasarer. De høyenergiske fotonene vekselvirker med bakgrunnsfotoner ...
    • Inside out: unveiling local interstellar spectra of cosmic ray species 

      Boschini, M.J.; Della Torre, S.; Gervasi, M.; Grandi, D.; Johannesson, G.; Kachelriess, Michael; La Vacca, G.; Masi, N.; Moskalenko, I. V.; Orlando, E.; Ostapchenko, S. S.; Pensotti, S.; Porter, T. A.; Quadrani, L.; Rancoita, P. G.; Rozza, D.; Tacconi, M. (Journal article; Peer reviewed, 2018)
      Local interstellar spectra (LIS) for protons, helium and antiprotons are built using the most recent experimental results combined with state-of-the-art models for propagation in the Galaxy and Heliosphere. Two propagation ...
    • Maximum Likelihood Analysis of IceCube Data: - Could Decaying Dark Matter explain the high energy Neutrino Excess? 

      Leinaas, Jan Erik (Master thesis, 2015)
      In this theoretical physics master thesis I've looked at a set of observations from a neutrino observatory in Antarctica called IceCube. This observatory has observed more high energy neutrinos than expected. I wanted to ...