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The dark dimension, the Swampland, and the origin of cosmic rays beyond the GZK barrier
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The dark dimension, the Swampland, and the origin of cosmic rays beyond the GZK barrier
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Very recently, it was pointed out that when basic ideas of the Swampland program are combined with the cosmological hierarchy problem (i.e. the smallness of the dark energy in Planck units) and together are confronted to experiment lead to the prediction of the existence of a single extra-dimension (dubbed the dark dimension) with characteristic length-scale in the micron range. We propose a feasible test procedure to probe the dark dimension using the highest energy cosmic rays.
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