Higgs-R2 inflation is a well-motivated model of inflation as it solves the unitarity issue of Higgs inflation, is consistent with the current CMB observation, and is within the scope of the near future B-mode observation. In this talk, I will first review these basic properties of Higgs-R2 inflation. I then show that the isocurvature mode, which is a mixture of the Higgs boson and the scalaron, ca
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