Acceleration Mechanisms for Ultra High Energy Cosmic Rays

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The book explores the challenges posed by ultra high energy cosmic rays (UHECRs) and their origins, focusing on theoretical approaches to understand their acceleration mechanisms. It discusses past models involving elastic scattering of cosmic particles and shock waves from supernova remnants, which explain energies up to 10^15 eV. It further examines interactions between cosmic charged particles and varying magnetic fields, particularly in pulsars and magnetars, suggesting that these interactions, along with Fermi mechanisms, can account for UHECRs reaching energies up to 10^22 eV.