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In Mbarek & Caprioli (2019), we laid the groundwork for studying the espressoparadigm Caprioli (2015), a reacceleration mechanism to boost galactic CRs toUHECR levels. Our bottom-up approach uses realistic 3D MHD simulations ofrelativistic AGN jets and accounts for all of the crucial ingredients of auniversal acceleration theory: injection, acceleration, and escape in realisticenvironments. Our results are consistent with the main features of UHECRspectra, i.e., power-law slopes, chemical composition, and anisotropy. InMbarek & Caprioli (2021), we refine our model by including sub-grid particlescattering to model small-scale magnetic turbulence that cannot be resolved byMHD simulations, constraining for the first time one crucial but hard-to-modelingredient, and allowing us to establish the relative importance of espressoand stochastic shear acceleration in relativistic jets. Our framework alsoenables us to analyze high-energy neutrinos produced from our acceleratedUHECRs considering the effects of external photon fields, and to incorporatenucleus photodisintegration. The spectra we obtain are consistent with thepicture drawn by observations with Auger, Telescope Array, and IceCubeobservatory.

Ultra-High-Energy Cosmic Rays and Neutrinos from Relativistic Jets of Active Galactic Nuclei