A Unitarity-Conserving Higgs Inflation Model

Details A Unitarity-Conserving Higgs Inflation Model A Unitarity-Conserving Higgs Inflation Model

2010-05-17

arxiv.org/abs/1005.2978v2

Phys.Rev.D82:103525,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, published version

Scientific paper

10.1103/PhysRevD.82.103525

Scalar field models of inflation based on a large nonminimal coupling to gravity xi, in particular, Higgs inflation, may violate unitarity at an energy scale ~ M_p / xi << M_p. In this case the model is incomplete at energy scales relevant to inflation. Here we propose a new unitarity-conserving model of Higgs inflation. The completion of the theory is achieved via additional interactions which are proportional to products of the derivatives of the Higgs doublet. The resulting model differs from the original version of Higgs inflation in its prediction for the spectral index, with a classical value n = 0.974. In the case of a nonsupersymmetric model, quantum corrections are likely to strongly modify the tree-level potential, suggesting that supersymmetry or a gauge singlet scalar inflaton is necessary for a completely successful model.

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