Influence of cosmological models on the GZK horizon of ultrahigh energy protons

We investigate how the density of baryonic and cold dark matter, the density of dark energy and the value of the Hubble parameter at the present time influence the propagation of ultrahigh energy protons in the nearby Universe. We take into account energy losses in the cosmic microwave radiation, th...

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Bibliographic Details
Published in:Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2013-01, Vol.40 (1), p.15201-21
Main Authors: De Domenico, M, Insolia, A
Format: Article
Language:English
Subjects:
cosmic microwave background radiation
cosmological probe
Cosmology
Density
Energy (nuclear)
extragalactic magnetic field
GZK
Horizon
Magnetic fields
Mathematical models
Microwaves
propagation
ultra-high energy cosmic rays
Universe
Λ-cold dark matter
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Summary:We investigate how the density of baryonic and cold dark matter, the density of dark energy and the value of the Hubble parameter at the present time influence the propagation of ultrahigh energy protons in the nearby Universe. We take into account energy losses in the cosmic microwave radiation, the only one relevant for protons above 1018 eV, and we explore the dependence of the Greisen-Zatsepin-Kuz'min (GZK) horizon on the cosmology. We investigate several cosmological scenarios, from matter dominated to energy dominated ones, and we consider the impact of uncertainties in the Hubble parameter in a Λ-cold dark matter (ΛCDM) Universe, estimated from recent observations, on the GZK horizon. The impact of the (unknown) extragalactic magnetic field on our study is discussed, as well as possible probes of the Hubble parameter attainable by current and future experiments.
ISSN:0954-3899
1361-6471
DOI:10.1088/0954-3899/40/1/015201