Unparticle-Higgs Mixing: MSW Resonances, See-saw Mechanism and Spinodal Instabilities

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dc.creatorBoyanovsky, D.
dc.creatorHolman, R.
dc.creatorHutasoit, Jimmy A.
dc.date2008-12-27
dc.date2009-04-23
dc.date.accessioned2026-07-07T13:07:06Z
dc.date.available2026-07-07T13:07:06Z
dc.descriptionMotivated by slow-roll inflationary cosmology we study a scalar unparticle weakly coupled to a Higgs field in the broken symmetry phase. The mixing between the unparticle and the Higgs field results in a seesaw type matrix and the mixing angles feature a Mikheyev-Smirnov-Wolfenstein (MSW) effect as a consequence of the unparticle field being noncanonical. We find two (MSW) resonances for small and large spacelike momenta. The unparticlelike mode features a nearly flat potential with spinodal instabilities and a large expectation value. An effective potential for the unparticlelike field is generated from the Higgs potential, but with couplings suppressed by a large power of the small seesaw ratio. The dispersion relation for the Higgs-like mode features an imaginary part even at "tree level" as a consequence of the fact that the unparticle field describes a multiparticle continuum. Mixed unparticle-Higgs propagators reveal the possibility of oscillations, albeit with short coherence lengths. The results are generalized to the case in which the unparticle features a mass gap, in which case a low energy MSW resonance may occur for lightlike momenta depending on the scales. Unparticle-Higgs mixing leads to an effective unparticle potential of the new-inflation form. Slow-roll variables are suppressed by seesaw ratios and the anomalous dimensions and favor a red spectrum of scalar perturbations consistent with cosmic microwave background data.
dc.description22 pages, 1 figure, RevTeX; v.2: a section on inflation added and references added
dc.identifierhttps://arxiv.org/abs/0812.4723
dc.identifierhttp://arxiv.org/abs/0812.4723
dc.identifierPhys. Rev. D 79, 085018 (2009)
dc.identifierdoi:10.1103/PhysRevD.79.085018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227986
dc.subjectHigh Energy Physics - Phenomenology
dc.titleUnparticle-Higgs Mixing: MSW Resonances, See-saw Mechanism and Spinodal Instabilities
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