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pro vyhledávání: '"Tjemsland J"'
High-energy photons can produce electron-positron pairs upon interacting with the extragalactic background light (EBL). These pairs will in turn be deflected by the intergalactic magnetic field (IGMF), before possibly up-scattering photons of the cos
Externí odkaz:
http://arxiv.org/abs/2311.04273
Autor:
Kachelriess, M., Tjemsland, J.
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 signatures in the energy spec
Externí odkaz:
http://arxiv.org/abs/2305.03604
Light (anti-) nuclei are a powerful tool both in collider physics and astrophysics. In searches for new and exotic physics, the expected small astrophysical backgrounds at low energies make these antinuclei ideal probes for, e.g., dark matter. At the
Externí odkaz:
http://arxiv.org/abs/2303.08437
Light antinuclei, like antideuteron and antihelium-3, are ideal probes for new, exotic physics because their astrophysical backgrounds are suppressed at low energies. In order to exploit fully the inherent discovery potential of light antinuclei, a r
Externí odkaz:
http://arxiv.org/abs/2206.00998
Autor:
Kachelriess, M., Tjemsland, J.
Photons propagating in an external magnetic field may oscillate into axions or axion-like particles (ALPs). Such oscillations will lead to characteristic features in the energy spectrum of high-energy photons from astrophysical sources that can be us
Externí odkaz:
http://arxiv.org/abs/2111.08303
In a recent Letter, it was suggested that a previously neglected Standard Model process, namely, the production of antihelium-3 nuclei through decays of $\bar\Lambda_b$ baryons can lead to a flux of antihelium-3 from dark matter annihilations detecta
Externí odkaz:
http://arxiv.org/abs/2105.00799
Autor:
Kachelriess, M., Tjemsland, J.
Decays of mesons produced in cosmic ray induced air showers in Earth's atmosphere can lead to a flux of light exotic particles which can be detected in underground experiments. We evaluate the energy spectra of the light neutral mesons $\pi^0$, $\eta
Externí odkaz:
http://arxiv.org/abs/2104.06811
Autor:
Tjemsland, J.
The production mechanism of light nuclei, such as deuteron, helium-3, tritium and their antiparticles, has recently attracted an increased attention from the astroparticle and heavy ion communities. The expected low astrophysical background of light
Externí odkaz:
http://arxiv.org/abs/2012.12252
The formation of light nuclei can be described as the coalescence of clusters of nucleons into nuclei. In the case of small interacting systems, such as dark matter and $e^+e^-$ annihilations or $pp$ collisions, the coalescence condition is often imp
Externí odkaz:
http://arxiv.org/abs/2012.04352
Autor:
Kachelriess, M., Tjemsland, J.
Charged particles scattering on moving inhomogenities of the magnetised interstellar medium can gain energy through the process of second-order Fermi acceleration. This energy gain depletes in turn the magnetic wave spectrum around the resonance wave
Externí odkaz:
http://arxiv.org/abs/2006.10479