TY - JOUR
T1 - The R-axion and non-Gaussianity
AU - Nakayama, Kazunori
AU - Takahashi, Fuminobu
N1 - Funding Information:
K.N. would like to thank the Japan Society for the Promotion of Science for financial support. The work of F.T. was supported by JSPS Grant-in-Aid for Young Scientists (B) ( 21740160 ). This work was supported by World Premier International Center Initiative (WPI Program), MEXT , Japan.
PY - 2009/9/7
Y1 - 2009/9/7
N2 - We study cosmological implications of an R-axion, a pseudo Nambu-Goldstone boson associated with spontaneous breaking of an U (1)R symmetry, focusing on its quantum fluctuations generated during inflation. We show that, in the anomaly mediation, the R-axion decays into a pair of gravitinos, which eventually decay into the visible particles producing the neutralino LSP. As a result, the quantum fluctuations of the R-axion are inherited by the cold dark matter isocurvature density perturbation with potentially large non-Gaussianity. The constraints on the inflation scale and the initial misalignment are derived.
AB - We study cosmological implications of an R-axion, a pseudo Nambu-Goldstone boson associated with spontaneous breaking of an U (1)R symmetry, focusing on its quantum fluctuations generated during inflation. We show that, in the anomaly mediation, the R-axion decays into a pair of gravitinos, which eventually decay into the visible particles producing the neutralino LSP. As a result, the quantum fluctuations of the R-axion are inherited by the cold dark matter isocurvature density perturbation with potentially large non-Gaussianity. The constraints on the inflation scale and the initial misalignment are derived.
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U2 - 10.1016/j.physletb.2009.08.020
DO - 10.1016/j.physletb.2009.08.020
M3 - Article
AN - SCOPUS:69149087155
SN - 0370-2693
VL - 679
SP - 436
EP - 439
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 5
ER -