Speaker
Description
The Telescope Array Collaboration recently reported the detection of a cosmic-ray particle, “Amaterasu,” with an extremely high energy of 2.4 × 10^20 eV. No powerful enough candidate sources are located within the region consistent with its propagation horizon and arrival direction, raising question about its origin. This puzzling feature has led to proposals of past astrophysical transient sources, ultra-heavy cosmic rays, Lorentz invariance violation, and superheavy dark matter as possible explanations for its observation. Prior to the the Amaterasu event, an even more energetic event, Fly’s Eye event (E = (3.2 x 10^20 eV was observed in 1995. Two other extremely energetic events, within one standard deviation of the Amaterasu particle, have also been previously reported by the Pierre Auger Collaboration. We will review the current situation vis a vis these extremely energetic events and their potential for revealing new physics.
| Field of contribution | Phenomenology |
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