SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 144: Cosmic Ray VII
T 144.3: Vortrag
Donnerstag, 23. März 2023, 18:00–18:15, POT/0013
The effects of a ΛCDM extension on the propagation of UHECRs — •Janning Meinert — Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
Current tensions in the cosmological parameters of ΛCDM (such as H0, Ωm, σ8) motivate a possible extension. Treating the photon propagation in thermal equilibrium with an SU(2) gauge group instead of a U(1) gauge group gives the photon more degrees of freedom and thus changes the temperature redshift relation. This pushes the emergence of the CMB, recombination, to higher redshifts and dilutes the photon density. Since CMB photons interact with ultra-high energy cosmic rays (UHECRs), I will examine the effects of this particular ΛCDM extension on the interaction with UHECRs. In particular, the spectral shape of the cosmogenic neutrino flux is distorted and the GZK cutoff might be shifted to slightly higher energies.
*Supported by DFG (SFB 1491) and the Vector Foundation under grant number P2021-0102