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Unitarity-violation in generalized Higgs inflation models

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number019
<mark>Journal publication date</mark>11/2012
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number11
Number of pages20
Publication StatusPublished
<mark>Original language</mark>English


Unitarity-violation presents a challenge for non-minimally coupled models of inflation based on weak-scale particle physics. We examine the energy scale of tree-level unitarity-violation in scattering processes for generalized models with multiple scalar fields where the inflaton is either a singlet scalar or the Higgs. In the limit that the non-minimal couplings are all equal (e. g. in the case of Higgs or other complex inflaton), the scale of tree-level unitarity-violation matches the existing result. However if the inflaton is a singlet, and if it has a larger non-minimal coupling than other scalars in the model, then this hierarchy increases the scale of tree-level unitarity-violation. A sufficiently strong hierarchy pushes the scale of tree-level unitarity-violation above the Planck scale. We also discuss models which attempt to resolve the issue of unitarity-violation in Higgs Inflation.