Predictive Landscapes and New Physics at a TeV

By N. Arkani-Hamed, S. Dimopoulos, S. Kachru. 2005

221 citations recorded by the source corpus.

We propose that the Standard Model is coupled to a sector with an enormous landscape of vacua, where only the dimensionful parameters--the vacuum energy and Higgs masses--are finely ''scanned'' from one vacuum to another, while dimensionless couplings are effectively fixed. This allows us to preserve achievements of the usual unique-vacuum approach in relating dimensionless couplings while also accounting for the success of the anthropic approach to the cosmological constant problem. It can also explain the proximity of the weak scale to the geometric mean of the Planck and vacuum energy scales. We realize this idea with field theory landscapes consisting of N fields and 2{sup N} vacua, where the fractional variation of couplings is smaller than 1/{radical}N. These lead to a variety of low-energy theories including the Standard Model, the MSSM, and Split SUSY. This picture suggests sharp new rules for model-building, providing the first framework in which to simultaneously address the cosmological constant problem together with the big and little hierarchy problems. Requiring the existence of atoms can fix ratio of the QCD scale to the weak scale, thereby providing a possible solution to the hierarchy problem as well as related puzzles such as the {mu} and doublet-triplet splittingmore » problems. We also present new approaches to the hierarchy problem, where the fine-tuning of the Higgs mass to exponentially small scales is understood by even more basic environmental requirements such as vacuum stability and the existence of baryons. These theories predict new physics at the TeV scale, including a dark matter candidate. The simplest theory has weak-scale ''Higgsinos'' as the only new particles charged under the Standard Model, with gauge coupling unification near 10{sup 14} GeV.« less

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5346e61901dd10953bc451f9433f969d427da2ae

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Citations in the corpus

Minimal model for dark matter and unification (2005, methodology): “This mechanism for dealing with both issues simultaneously by scanning all relevant parameters of the low energy theory within a landscape was recently proposed in [7, 8].”
Causality, analyticity and an IR obstruction to UV completion (2006, background): “With a vast landscape of vacua, seemingly intractable fine-tuning puzzles such as the cosmological constant problem [2], and perhaps even the hierarchy problem [3], can be solved by being demoted from fundamental questions to environmental ones, suggesting new models for particle physics [4].”
Type IIA Moduli Stabilization (2005, background): “In general the larger the � parameter is for a given ensemble, the more moduli can be fixed, and the less “friendly” the distribution will be (in the language of [ 34 ]); similar observations have been put forward in [10, 32].”
Phenomenology of hidden valleys at hadron colliders (2007, background): “reaking [1–3], gauge mediated SUSY breaking [4–6], Twin Higgs models [7], milli-charged hidden sector dark matter [8,9] or unparticle physics [10,11]. String models also generate hidden sector matter [12,13]. We consider in this paper a class of hidden sector models which are characterized by a new ”
Systematics of moduli stabilisation in Calabi-Yau flux compactifications (2005, background): “Because of the dependence on the discrete flux choice, the superpotential and the associated supersymmetry breaking scale are scanned by the different vacua, and we are led to regard these quantities as environmentally (rather than dynamically) determined in our world [8].”