Comment on Higgs Inflation and Naturalness

Details Comment on Higgs Inflation and Naturalness Comment on Higgs Inflation and Naturalness

2010-02-13

arxiv.org/abs/1002.2730v3

JHEP 1007:007,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure V3: Journal Version

Scientific paper

We rebut the recent claim (arXiv:0912.5463) that Einstein-frame scattering in the Higgs inflation model is unitary above the cut-off energy Lambda ~ Mp/xi. We show explicitly how unitarity problems arise in both the Einstein and Jordan frames of the theory. In a covariant gauge they arise from non-minimal Higgs self-couplings, which cannot be removed by field redefinitions because the target space is not flat. In unitary gauge, where there is only a single scalar which can be redefined to achieve canonical kinetic terms, the unitarity problems arise through non-minimal Higgs-gauge couplings.

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