A minimal gauge inflation model

  • In this paper, we present a gauge inflation model based on the orbifold M4×S1/Z2 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, g4 ≲ 1/(2πRMP), with the compactification radius (10 ≲ RMP ≲ 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.
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Jinn-Ouk Gong and Seong Chan Park. A minimal gauge inflation model[J]. Chinese Physics C, 2018, 42(9): 095102. doi: 10.1088/1674-1137/42/9/095102
Jinn-Ouk Gong and Seong Chan Park. A minimal gauge inflation model[J]. Chinese Physics C, 2018, 42(9): 095102.  doi: 10.1088/1674-1137/42/9/095102 shu
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Received: 2018-06-04
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    supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (2016R1A2B2016112)

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A minimal gauge inflation model

    Corresponding author: Seong Chan Park,
  • 1.  Korea Astronomy and Space Science Institute, Daejeon 34055, Korea
  • 2.  Department of Physics and IPAP, Yonsei University, Seoul 03722, Korea
Fund Project:  supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (2016R1A2B2016112)

Abstract: In this paper, we present a gauge inflation model based on the orbifold M4×S1/Z2 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, g4 ≲ 1/(2πRMP), with the compactification radius (10 ≲ RMP ≲ 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.

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