10,526 research outputs found

    Renormalization Invariants and Quark Flavor Mixings

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    A set of renormalization invariants is constructed using approximate, two-flavor, analytic solutions for RGEs. These invariants exhibit explicitly the correlation between quark flavor mixings and mass ratios in the context of the SM, DHM and MSSM of electroweak interaction. The well known empirical relations θ23∝ms/mb\theta_{23}\propto m_s /m_b , θ13∝md/mb\theta_{13}\propto m_d /m_b can thus be understood as the result of renormalization evolution toward the infrared point. The validity of this approximation is evaluated by comparing the numerical solutions with the analytical approach. It is found that the scale dependence of these quantities for general three flavoring mixing follows closely these invariants up to the GUT scale.Comment: 23 pages, 7 figure

    Evolution of the CKM Matrix in the Universal Extra Dimension Model

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    The evolution of the Cabibbo-Kobayashi-Maskawa matrix and the quark Yukawa couplings is performed for the one-loop renormalization group equations in the universal extra dimension model. It is found that the evolution of mixing angles and the CP violation measure J may rapidly vary in the presence of the Kaluza-Klein modes, and this variation becomes dramatic as the energy approaches the unification scale.Comment: 10 pages, 4 figure

    Gradient flow approach to an exponential thin film equation: global existence and latent singularity

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    In this work, we study a fourth order exponential equation, ut=Δe−Δu,u_t=\Delta e^{-\Delta u}, derived from thin film growth on crystal surface in multiple space dimensions. We use the gradient flow method in metric space to characterize the latent singularity in global strong solution, which is intrinsic due to high degeneration. We define a suitable functional, which reveals where the singularity happens, and then prove the variational inequality solution under very weak assumptions for initial data. Moreover, the existence of global strong solution is established with regular initial data.Comment: latent singularity, curve of maximal slope. arXiv admin note: text overlap with arXiv:1711.07405 by other author
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