Unitarizing Higgs Inflation

By G. Giudice, Hyun Min Lee. 2010

198 citations recorded by the source corpus.

Abstract We consider a simple extension of the Standard Model Higgs inflation with one new real scalar field which preserves unitarity up to the Planck scale. The new scalar field (called sigma) completes in the ultraviolet the theory of Higgs inflation by linearizing the Higgs kinetic term in the Einstein frame, just as the non-linear sigma model is unitarized into its linear version. The unitarity cutoff of the effective theory, obtained by integrating out the sigma field, varies with the background value of the Higgs field. In our setup, both the Higgs field and the sigma field participate in the inflationary dynamics, following the flat direction of the potential. We obtain the same slow-roll parameters and spectral index as in the original Higgs inflation but we find that the Hubble rate during inflation depends not only on the Higgs self-coupling, but also on the unknown couplings of the sigma field.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/329620674e897a8388bb6bac8387d332dec59f83

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Citations in the corpus

Dynamically induced Planck scale and inflation (2015, background): “Notice that a large ξ-coupling does not necessarily spoil perturbative unitarity if the VEV of the corresponding scalar field is large [68, 86].”
Superconformal symmetry, NMSSM, and inflation (2010, background): “However, those who want to feel even better protected against this problem may either try to use a consistent UV completion of this model [36], or switch to the NMSSM and study the model with λ 1, where the presumed unitarity bound Λ ∼ 1/ξ is well above the typical energy scale of inflation H ≈ √ λ ”
Stabilization of the electroweak vacuum by a scalar threshold effect (2012, background): “As described in [53], in this scenario the sigma field dominates inflation due to its large non-minimal coupling to R while the Higgs field follows the sigma field along a flat direction, provided λHσ < 0.”
Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke (2016, methodology): “A possible way out of the unitarity problem of Higgs inflation was put forward in [99] (see also [127] for another approach).”
Higgs Inflation (2018, background): “This cutoff could either indicate the onset of a strongly coupled regime to be studied within the model by nonperturbative techniques (such as resummations, lattice simulations or functional renormalization studies) [140–143] or the appearance of new degrees of freedom beyond the initially-assumed S”
Higgs mass and vacuum stability in the Standard Model at NNLO (2012, background): “One solution is to add new degrees of freedom that restore perturbative unitarity [53, 54], although the minimality of the model is then lost.”
Inflationary Cosmology after Planck 2013 (2014, background): “The recent revival of interest to these models was related to the possibility that the Higgs field of the standard model may play the role of the inflaton [111, 113], which would require λ = O(1) and ξ ∼ 10(5).”