Blar i NTNU Open på forfatter "Kachelriess, Michael"

Viser treff 1-20 av 51

    • A hot spot in the neutrino flux from the Cygnus loop SNR 

      Bouyahiaoui, Makarim; Kachelriess, Michael; Semikoz, Dimitry (Peer reviewed; Journal article, 2021)

    • 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 ...

    • Alternative coalescence model for deuteron, tritium, helium-3 and their antinuclei 

      Kachelriess, Michael; Ostapchenko, Sergey; Tjemsland, Jonas (Peer reviewed; Journal article, 2020)
      Antideuteron and antihelium nuclei have been proposed as a detection channel for dark matter annihilations and decays in the Milky Way, due to the low astrophysical background expected. To estimate both the signal for ...

    • 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 ...

    • Cosmic-ray antinuclei as messengers of new physics: Status and outlook for the new decade 

      Von Doetinchem, Doetinchem; Perez, K.; Aramaki, T.; Baker, S.; Barwick, S.; Bird, R.; Boezio, M.; Boggs, S. E.; Cui, M.; Datta, A.; Donato, Fiorenza; Evoli, C.; Fabris, L.; Fabbietti, L.; Bueno, E. Ferronato; Fornengo, N.; Fuke, H.; Gerrity, C.; Coral, D. Gomez; Hailey, C. J.; Hooper, D.; Kachelriess, Michael; Korsmeier, M.; Kozai, M.; Lea, R.; Li, N.; Lowell, A.; Manghisoni, M.; Moskalenko, Igor V.; Munini, R.; Naskret, M.; Nelson, T.; Ng, K.C.Y.; Nozzoli, F.; Oliva, A.; Ong, R. A.; Osteria, G.; Pierog, T.; Poulin, Vivian; Profumo, S.; Pöschl, T.; Quinn, S.; Re, V.; Rogers, F.; Ryan, J.; Saffold, N.; Sakai, K.; Salati, P.; Schael, S.; Serksnyte, L.; Shukla, A.; Stoessl, A.; Tjemsland, Jørgen; Vannuccini, E.; Vecchi, M.; Winkler, M.W.; Wright, D.; Xiao, M.; Xu, W.; Yoshida, T.; Zampa, G.; Zuccon, P. (Peer reviewed; Journal article, 2020)
      The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature of dark matter and other new astrophysical phenomena, and could be used with other cosmic-ray species to understand ...

    • 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 ...

    • Detecting ALP wiggles at TeV energies 

      Kachelriess, Michael; Tjemsland, Jonas (Peer reviewed; Journal article, 2024)
      Axions and axion-like-particles (ALPs) are characterised by their two-photon coupling, which entails so-called photon-ALP oscillations as photons propagate through a magnetic field. These oscillations lead to distinctive ...

    • Detection of Millicharged Dark Matter in Underground Detectors 

      Schüller, Kristine (Master thesis, 2023)
      Milliladede partikler er mulige kandidater i søket etter mørk materie, og de kan produseres i kosmiske stråleinteraksjoner via forfall av mesoner. Fra den kosmiske meson-fluksen finner vi den tilsvarende fluksen av milliladede ...

    • 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 ...

    • Extragalactic Cosmic Rays 

      Kachelriess, Michael (Peer reviewed; Journal article, 2022)
      I review the status of ultrahigh-energy cosmic ray (UHECR) physics. After introducing the main experimental results and summarizing possible intepretations, I discuss observational and theoretical constraints on the sources ...