Speaker
Description
In this talk, we will investigate the origin of the ultra-high-energy neutrino event KM3-230213A (∼220 PeV) and the high-energy flux observed by the IceCube Observatory within a unified framework in which superheavy dark matter (DM) is produced via primordial black hole (PBH) evaporation and subsequently decays into neutrinos. We will discuss constraints on the PBH initial abundance parameter as a function of the initial PBH mass and the DM mass, requiring consistency with the observed relic DM density. The resulting neutrino flux demonstrates that DM masses in the PeV–EeV range can account for both KM3-230213A and IceCube events without invoking accompanying multimessenger signals, while remaining consistent with current cosmological and astrophysical bounds.
We will further discuss the impact of quantum memory burden effects on the allowed parameter space, highlighting potential shifts in the viable regions. As an additional implication, we will also discuss the effect of ultra-high-energy neutrino production from PBH evaporation on the global 21-cm brightness temperature, thereby establishing a novel connection between high-energy neutrino observations and cosmological probes of the early Universe.
| Other topic / keywords: | Primordial Black Holes, Dark Matter, Neutrinos |
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