4,258 research outputs found

    Reexploration of interacting holographic dark energy model: Cases of interaction term excluding the Hubble parameter

    Full text link
    In this paper, we make a deep analysis for the five typical interacting holographic dark energy models with the interaction terms Q=3βH0ρdeQ=3\beta H_{0}\rho_{\rm{de}}, Q=3βH0ρcQ=3\beta H_{0}\rho_{\rm{c}}, Q=3βH0(ρde+ρc)Q=3\beta H_{0}(\rho_{\rm{de}}+\rho_{\rm c}), Q=3βH0ρdeρcQ=3\beta H_{0}\sqrt{\rho_{\rm{de}}\rho_{\rm c}}, and Q=3βH0ρdeρcρde+ρcQ=3\beta H_{0}\frac{\rho_{\rm{de}}\rho_{c}}{\rho_{\rm{de}}+\rho_{\rm c}}, respectively. We obtain observational constraints on these models by using the type Ia supernova data (the Joint Light-curve Analysis sample), the cosmic microwave background data (Planck 2015 distance priors), the baryon acoustic oscillations data, and the direct measurement of the Hubble constant. We find that the values of χmin2\chi_{\rm min}^2 for all the five models are almost equal (around~699), indicating that the current observational data equally favor these IHDE models. In addition, a comparison with the cases of interaction term involving the Hubble parameter HH is also made.Comment: 14 pages, 6 figures. arXiv admin note: text overlap with arXiv:1710.0306

    Transition magnetic moment of Majorana neutrinos in the μν\mu\nuSSM

    Get PDF
    The nonzero vacuum expectative values of sneutrinos induce spontaneously R-parity and lepton number violation, and generate three tiny Majorana neutrino masses through the seesaw mechanism in the μν\mu\nuSSM, which is one of Supersymmetric extensions beyond Standard Model. Applying effective Lagrangian method, we study the transition magnetic moment of Majorana neutrinos in the model here. Under the constraints from neutrino oscillations, we consider the two possibilities on the neutrino mass spectrum with normal or inverted ordering.Comment: 20 pages, 2 figures, accepted for publication in JHEP. arXiv admin note: text overlap with arXiv:1305.4352, arXiv:1304.624
    corecore