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Solving the Hierarchy Problem at Reheating with a Large Number of Degrees of Freedom
Nima Arkani-Hamed1, Timothy Cohen2, Raffaele Tito D'Agnolo1
1School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA.
Abstract:
We present a new solution to the electroweak hierarchy problem. We introduce N copies of the standard model with varying values of the Higgs mass parameter. This generically yields a sector whose weak scale is parametrically removed from the cutoff by a factor of 1/sqrt[N]. Ensuring that reheating deposits a majority of the total energy density into this lightest sector requires a modification of the standard cosmological history, providing a powerful probe of the mechanism. Current and near-future experiments can explore much of the natural parameter space. Furthermore, supersymmetric completions that preserve grand unification predict superpartners with mass below m_{W}M_{pl}/M_{GUT}∼10 TeV.
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