Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-06-08
Nucl.Phys.B699:65-89,2004; Erratum-ibid.B706:65-89,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, comments, corrections and references added
Scientific paper
10.1016/j.nuclphysb.2004.11.048
The naturalness criterion applied to the cosmological constant implies a new-physics threshold at 10^-3 eV. Either the naturalness criterion fails, or this threshold does not influence particle dynamics at higher energies. It has been suggested that the Higgs naturalness problem may follow the same fate. We investigate this possibility and, abandoning the hierarchy problem, we use unification and dark matter as the only guiding principles. The model recently proposed by Arkani-Hamed and Dimopoulos emerges as a very interesting option. We study it in detail, analysing its structure, and the conditions for obtaining unification and dark matter.
Giudice Gian F.
Romanino Andrea
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