8,721 research outputs found

    Two component dark matter with multi-Higgs portals

    Full text link
    With the assistance of two extra groups, i.e., an extra hidden gauge group SU(2)DSU(2)_D and a global U(1)U(1) group, we propose a two component dark matter (DM) model. After the symmetry SU(2)D×U(1)SU(2)_D\times U(1) being broken, we obtain both the vector and scalar DM candidates. The two DM candidates communicate with the standard model (SM) via three Higgs as multi-Higgs portals. The three Higgs are mixing states of the SM Higgs, the Higgs of the hidden sector and real part of a supplement complex scalar singlet. We study relic density and direct detection of DM in three scenarios. The resonance behaviors and interplay between the two component DM candidates are represented through investigating of the relic density in the parameter spaces of the two DMs masses. The electroweak precision parameters constrains the two Higgs portals couplings (λm\lambda_m and δ2\delta_2). The relevant vacuum stability and naturalness problem in the parameter space of λm\lambda_m and δ2\delta_2 are studied as well. The model could alleviate these two problems in some parameter spaces under the constraints of electroweak precision observables and Higgs indirect search.Comment: 27 pages, 16 figures. Version accepted for publication in JHE

    The existence and uniqueness of mild solutions for fractional differential equations with nonlocal conditions of order 1<α<2

    Get PDF
    AbstractThis paper is mainly concerned with the existence of mild solutions for fractional differential equations with nonlocal conditions of order 1<α<2. The results are obtained by the fixed point theorem combined with solutions operator theorems
    • …
    corecore