Linking light scalar modes with a small positive cosmological constant in string theory
Abstract
Based on the studies in Type IIB string theory phenomenology, we conjecture that a good fraction of the meta-stable de Sitter vacua in the cosmic stringy landscape tend to have a very small cosmological constant Λ when compared to either the string scale M S or the Planck scale M P , i.e., Λ ≪ M S 4 ≪ M P 4 . These low lying de Sitter vacua tend to be accompanied by very light scalar bosons/axions. Here we illustrate this phenomenon with the bosonic mass spectra in a set of Type IIB string theory flux compactification models. We conjecture that small Λ with light bosons is generic among de Sitter solutions in string theory; that is, the smallness of Λ and the existence of very light bosons (may be even the Higgs boson) are results of the statistical preference for such vacua in the landscape. We also discuss a scalar field ϕ 3 /ϕ 4 model to illustrate how this statistical preference for a small Λ remains when quantum loop corrections are included, thus bypassing the radiative instability problem.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- June 2017
- DOI:
- 10.1007/JHEP06(2017)094
- arXiv:
- arXiv:1611.05786
- Bibcode:
- 2017JHEP...06..094T
- Keywords:
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- Strings and branes phenomenology;
- High Energy Physics - Theory
- E-Print:
- 35 pages, 7 figures