118478816
Dependence of Neutrino Mixing Angles and CP-violating Phase on Mixing Matrix Parametrizations
We consider various neutrino mixing matrix parametrizations and the dependence of the mixing angles and CP-violating phase on the different parametrizations. The transformations of neutrino mixing parameters between various parametrizations are presented. Although the $\theta_{13}$ mixing angle is determined to be small in the conventional parametrization, we note that in several other parametrizations the values of $\theta_{13}$ are quite large. Should the value of $\theta_{13}$ turn out to be tiny in the conventional parametrization, this study suggests that other alternative mixing matrix representations would be more suitable for dertermining the value of the CP-violating phase.
122731978
Search for Non-zero Neutrino Magnetic Moments Using Super-Kamiokande-I Solar Neutrino Data
206022588
Quintessence with O(N) symmetry
We study a new class of quintessence models, in which the scalar field possesses an O(N) internal symmetry. We give a critical condition of instability for the potential against Q ball formation. We find that the most widely used potentials of quintessence do not satisfy the above condition, and therefore, the O(N) quintessence with these potentials will not lead to Q ball formation. It is worth noting that the O(N) quintessence with a cosine-type potential is especially interesting in that the angular contribution is not negligible.
8716790
Born-Infeld type phantom on the brane world
We study the evolution of Born-Infeld-type phantom in the second Randall-Sundrum brane scenario, and find that there exists attractor solution for the potential with a maximum, which implies a cosmological constant at the late time. Especially, we discuss the BI model of constant potential without and with dust matter. In the weak tension limit of the brane, we obtain an exact solution for the BI phantom and scale factor and show that there is no big rip during the evolution of the brane.