The paper derives 90% C.L. upper limits on milli-charged kinetic mixing from a private fit to Auger hybrid data and claims a newly excluded region, but the analysis is not reproducible and the text is internally inconsistent.
Trans-Planckian wimpzillas
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abstract
Two previously proposed conjectures--gravitational trans-Planckian particle creation in the expanding universe, and the existence of ultra-heavy stable particles with masses up to the Planck scale (wimpzillas)--are combined in a proposal for trans-Planckian particle creation of wimpzillas. This new scenario leads to a huge enhancement in their production compared to mechanisms put forward earlier. As a result, it requires the trans-Planckian particle creation parameter to be rather small to avoid overproduction of such particles, much less than that is required for observable effects in the primordial perturbation spectrum. This ensures also that wimpzillas are mainly created at the end of primordial inflation. Conditions under which trans-Planckian wimpzillas can constitute the present dark matter are determined.
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Measurement of Downward-going Milli-charged particles beyond GZK cutoff at the Pierre Auger Observatory
The paper derives 90% C.L. upper limits on milli-charged kinetic mixing from a private fit to Auger hybrid data and claims a newly excluded region, but the analysis is not reproducible and the text is internally inconsistent.