In this paper, we present a gauge inflation model based on the orbifold with non-Abelian SU(2) gauge symmetry, which is probably the simplest model in this category. As the inflaton potential is fully radiatively generated exclusively by gauge self-interactions, the model is predictive; thus, it is protected by gauge symmetry itself, without the introduction of any additional matter fields or arbitrary interactions. We show that the model fully agrees with the recent cosmological observations within the controlled perturbative regime of gauge interactions, g 4 ≲ 1/(2πRM P), with the compactification radius (10 ≲ RM P ≲ 100): the expected magnitude of the curvature perturbation power spectrum and the value of the corresponding spectral index are in perfect agreement with the recent observations. The model also predicts a large fraction of the gravitational waves, negligible non-Gaussianity, and a sufficiently high reheating temperature.
Bibliographical noteFunding Information:
Received 4 June 2018, Published online 24 July 2018 ∗ JG was supported in part by the Basic Science Research Program through the National Research Foundation of Korea Research Grant 2016R1D1A1B03930408, a TJ Park Science Fellowship of the POSCO TJ Park Foundation; SCP was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (2016R1A2B2016112) 1) E-mail: email@example.com ©2018 Chinese Physical Society and the Institute of High Energy Physics Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd
© 2018 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
- extra dimension