1,413 research outputs found

    Mott Insulator-Superfluid Transition in a Generalized Bose-Hubbard Model with Topologically Non-trivial Flat-Band

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    In this paper, we studied a generalized Bose-Hubbard model on a checkerboard lattice with topologically nontrivial flat-band. We used mean-field method to decouple the model Hamiltonian and obtained phase diagram by Landau theory of second-order phase transition. We further calculate the energy gap and the dispersion of quasi-particle or quasi-hole in Mott insulator state and found that in strong interaction limit the quasi-particles or the quasi-holes also have flat bands.Comment: 13 figures, 9 page

    The naturalness in the BLMSSM and B-LSSM

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    In order to interpret the Higgs mass and its decays more naturally, we hope to intrude the BLMSSM and B-LSSM. In the both models, the right-handed neutrino superfields are introduced to better explain the neutrino mass problems. In addition, there are other superfields considered to make these models more natural than MSSM. In this paper, the method of χ2\chi^2 analyses will be adopted in the BLMSSM and B-LSSM to calculate the Higgs mass, Higgs decays and muon g2g-2. With the fine-tuning in the region 0.67%2.5%0.67\%-2.5\% and 0.67%5%0.67\%-5\%, we can obtain the reasonable theoretical values that are in accordance with the experimental results respectively in the BLMSSM and B-LSSM. Meanwhile, the best-fitted benchmark points in the BLMSSM and B-LSSM will be acquired at minimal (χminBL)2=2.34736(\chi^{BL}_{min})^2 = 2.34736 and (χminBL)2=2.47754(\chi^{B-L}_{min})^2 = 2.47754, respectively

    The order analysis for the two loop corrections to lepton MDM

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    The experimental data of the magnetic dipole moment(MDM) of lepton(ee, μ\mu) is very exact. The deviation between the experimental data and the standard model prediction maybe come from new physics contribution. In the supersymmetric models, there are very many two loop diagrams contributing to the lepton MDM. In supersymmetric models, we suppose two mass scales MSHM_{SH} and MM with MSHMM_{SH}\gg M for supersymmetric particles. Squarks belong to MSHM_{SH} and the other supersymmetric particles belong to MM. We analyze the order of the contributions from the two loop diagrams. The two loop triangle diagrams corresponding to the two loop self-energy diagram satisfy Ward-identity, and their contributions possess particular factors. This work can help to distinguish the important two loop diagrams giving corrections to lepton MDM.Comment: 12 pages, 3 figure

    Adversarial Connective-exploiting Networks for Implicit Discourse Relation Classification

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    Implicit discourse relation classification is of great challenge due to the lack of connectives as strong linguistic cues, which motivates the use of annotated implicit connectives to improve the recognition. We propose a feature imitation framework in which an implicit relation network is driven to learn from another neural network with access to connectives, and thus encouraged to extract similarly salient features for accurate classification. We develop an adversarial model to enable an adaptive imitation scheme through competition between the implicit network and a rival feature discriminator. Our method effectively transfers discriminability of connectives to the implicit features, and achieves state-of-the-art performance on the PDTB benchmark.Comment: To appear in ACL201