2021/01/26 by Nobuhito Maru, Maru, Nobuhito, Akira Okawa +1 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2101.10634
openalex publication_date 2021/01/26 · openalex created_date 2021/02/01 · openalex updated_date 2026/07/28
Heavy fields of Hubble scale order present during inflation contribute to the non-Gaussian signature for the three-point function of the inflaton. Taking into account that Hubble scale is around the scale of grand unified theory (GUT), this opens a possibility that the GUT scale signatures, which are very hard to be discovered at collider, might be detectable by using information from the precise observations of cosmic microwave background. We discuss a detactability of the X, Y gauge boson present in any GUT in a framework of cosmological collider physics. Calculating one-loop contributions of X, Y gauge bosons to the inflaton three-point functions, we find a remarkable result that one-loop diagram with interactions originated from the mass terms of X, Y gauge bosons provides an enhancement factor expressed by the ratio between the X, Y gauge boson mass and Hubble scale as (mX/H)4. In an estimation of the non-Gaussianity, this factor is crucial and its impact on the detactability of X, Y gauge bosons is discussed.