Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP06(2017)094
Keywords
Strings and branes phenomenology
Categories
Funding
- CRF [HKUST4/CRF/13G]
- Research Grants Council (RGC) of the Government of the Hong Kong SAR [GRF 16305414]
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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 A when compared to either the string scale Ms or the Planck scale Mp, i.e., A << 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 A with light bosons is generic among de Sitter solutions in string theory; that is, the smallness of A 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 phi(3)/phi(4) model to illustrate how this statistical preference for a small A remains when quantum loop corrections are included, thus bypassing the radiative instability problem.
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