Abstract
Signals of heavy particle production during inflation are encoded as nonanalytic momentum scaling in primordial non-Gaussianity. These non-analytic signatures can be sourced by Standard Model particles with a modified Higgs scale uplifted by the slow-roll dynamics of inflation. We show that such a lifting mechanism becomes more efficient with the presence of a strong Higgs-inflaton mixing, where the Higgs mass scale is further increased by a small speed of sound in the effective theory of inflation. As a primary step towards detecting new particles in the cosmological collider program, non-Gaussianity due to heavy Higgs production in the strong-mixing regime can act as important background signals to be tested by future cosmological surveys.
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Wu, YP. Higgs as heavy-lifted physics during inflation. J. High Energ. Phys. 2019, 125 (2019). https://doi.org/10.1007/JHEP04(2019)125
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DOI: https://doi.org/10.1007/JHEP04(2019)125