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The results of simulations of the extragalactic propagation of ultra-highenergy cosmic rays (UHECRs) have intrinsic uncertainties due to poorly knownphysical quantities and approximations used in the codes. We quantify theuncertainties in the simulated UHECR spectrum and composition due to differentmodels for the extragalactic background light (EBL), differentphotodisintegration setups, approximations concerning photopion production andthe use of different simulation codes. We discuss the results for severalrepresentative source scenarios with proton, nitrogen or iron at injection. Forthis purpose we used SimProp and CRPropa, two publicly available codes forMonte Carlo simulations of UHECR propagation. CRPropa is a detailed andextensive simulation code, while SimProp aims to achieve acceptable resultsusing a simpler code. We show that especially the choices for the EBL model andthe photodisintegration setup can have a considerable impact on the simulatedUHECR spectrum and composition.

Effects of uncertainties in simulations of extragalactic UHECR propagation, using CRPropa and SimProp