Cosmological Collider Physics provides information on high-energy elementary
    particles by observing the spacetime fluctuations generated by inflation
    through the cosmic microwave background radiation. In other words, it is a
    method to investigate physics on energy scales that cannot be reached by
    terrestrial accelerators by means of precise observations of the universe. In
    this paper, we focus on the case where the GUT scale is close to the energy
    scale of inflation, and calculate the non-Gaussianity due to scalar
    fluctuations produced by the Higgs boson in GUT. The results are found to be
    consistent with the current observed restrictions on non-Gaussianity without a
    drastic fine tuning of parameters, which suggests the existence of Higgs boson
    in GUT.

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