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Higgs Inflation, Seesaw Physics and Fermion Dark Matter

Abstract

We present an inflationary model in which the Standard Model Higgs doublet field with non-minimal coupling to gravity drives inflation, and the effective Higgs potential is stabilized by new physics which includes a dark matter particle and right-handed neutrinos for the seesaw mechanism. All of the new particles are fermions, so that the Higgs doublet is the unique inflaton candidate. With central values for the masses of the top quark and the Higgs boson, the renormalization group improved Higgs potential is employed to yield the scalar spectral index ns0.968n_s \simeq 0.968, the tensor-to-scalar ratio r0.003r \simeq 0.003, and the running of the spectral index α=dns/dlnk5.2×104\alpha=dn_s/d \ln k \simeq -5.2 \times 10^{-4} for the number of e-folds N0=60N_0=60 (ns0.962n_s \simeq 0.962, r0.004r \simeq 0.004, and α7.5×104\alpha \simeq -7.5 \times 10^{-4} for N0=50N_0=50). The fairly low value of r0.003r \simeq 0.003 predicted in this class of models means that the ongoing space and land based experiments are not expected to observe gravity waves generated during inflation. [Dedicated to the memory of Dr. Paul Weber (1947 - 2015). Paul was an exceptional human being and a very special friend who will be sorely missed.]Comment: 15 pages, 3 figure

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