Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-04-19
Phys.Lett.B484:103-111,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex
Scientific paper
10.1016/S0370-2693(00)00605-5
Recent cosmological observations suggest the presence of small but nonzero cosmological constant $\Lambda_{cos}^4 \simeq (2 \times 10^{-3} eV)^4$. It is an intriguing possibility that such a small cosmological constant is supplied by the potential energy density of an ultralight axion-like field (called as quintessence axion). If this axion couples to the electroweak gauge fields, its potential may be generated by the electroweak instanton effects. We calculate the axion potential assuming the supersymmetric standard model and obtain a surprising result that the induced energy density of the quintessence axion field is very close to the value suggested from the observations.
Nomura Yasunori
Watari Taizan
Yanagida Takayuki
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