Amaterasu Cosmic Ray as Possible Support for Electromagnetic Acceleration

The Amaterasu (named for a sun goddess in Japanese mythology) cosmic ray particle announced in November 2023 is extraordinary. Its direction points back to the Local Void which contains no galaxies or known source. It is possible to show that the direction could not have been bent significantly by magnetic fields within the Milky Way. This collection of facts constitutes a paradox. In the present paper, we offer a resolution within the Electromagnetic Accelerating Universe (EAU) model in which a central r\^ole is played by charged Primordial Extremely Massive Black Holes (PEMBHs) whose Coulomb interactions underly accelerating expansion. Because structure formation of PEMBHs is electromagnetic while that for galaxies is gravitational, it is reasonable to expect PEMBHs inside the Local Void. We provide an example where the cosmic ray primary is an antiproton and present it as supportiing evidence for the EAU model.