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Light inflaton after LHC8 and WMAP9 results

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Abstract

We update the allowed parameter space of the simple chaotic inflationary model with quartic potential and light inflaton [1] taking into account recent results from cosmology (CMB observations from SPT, ACT and WMAP) and from particle physics (LHC hints of the SM Higgs boson). The non-minimal (yet small) coupling to gravity of the inflaton becomes essential to fit the observational data. The inflaton has mass above 300 MeV and can be searched for at B-factories in B-meson two-body decays to kaon and inflaton. The inflaton lifetime depends on the model parameters, resulting in various inflaton signatures: either a missing energy, or a displaced vertex from the B-meson decay position, or a resonance in the Dalitz plot of a three particle decay. We also discuss the implementation of the inflaton model to the νMSM, where the inflaton can be responsible for production of the dark matter sterile neutrino in the early Universe.

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Authors and Affiliations

  1. Physics Department, University of Connecticut, 2152 Hillside Road, Storrs, CT, 06269-3046, U.S.A.

    F. Bezrukov

  2. Physics Department, Brookhaven National Laboratory, Bldg 510a, Upton, NY, 11973-5000, U.S.A.

    F. Bezrukov

  3. Physics Department, Institute for Nuclear Research of the Russian Academy of Sciences, 7a 60th October anniversarry prosp., Moscow, 117312, Russia

    D. Gorbunov

  4. Faculty of Problems of Physics and Energetics, Moscow Institute of Physics and Technology, 9 Institutskiy pereulok, Dolgoprudny, 141700, Russia

    D. Gorbunov

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  1. F. Bezrukov
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Correspondence to F. Bezrukov.

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ArXiv ePrint: 1303.4395

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Bezrukov, F., Gorbunov, D. Light inflaton after LHC8 and WMAP9 results. J. High Energ. Phys. 2013, 140 (2013). https://doi.org/10.1007/JHEP07(2013)140

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  • DOI: https://doi.org/10.1007/JHEP07(2013)140

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