5,169 research outputs found
CP Violation and Extra Dimensions
It is shown that the new sources of CP violation can be generated in the
models with more than one extra dimensions. In the supersymmetric models on the
space-time , where the radius moduli have auxiliary vacuum
expectation values and the supersymmetry breaking is mediated by the
Kaluza-Klein states of gauge supermultiplets, we analyze the gaugino masses and
trilinear couplings for two scenarios and obtain that there exist relative CP
violating phases among the gaugino masses and trilinear couplings.Comment: Latex, 7 page
Constraints on Neutrino Velocities Revisited
With a minimally modified dispersion relation for neutrinos, we reconsider
the constraints on superluminal neutrino velocities from bremsstrahlung effects
in the laboratory frame. Employing both the direct calculation approach and the
virtual Z-boson approach, we obtain the generic decay width and energy loss
rate of a superluminal neutrino with general energy. The Cohen-Glashow's
analytical results for neutrinos with a relatively low energy are confirmed in
both approaches. We employ the survival probability instead of the terminal
energy to assess whether a neutrino with a given energy is observable or not in
the OPERA experiment. Moreover, using our general results we perform
systematical analyses on the constraints arising from the Super-Kamiokande and
IceCube experiments.Comment: RevTex4, 14 pages, 5 figures, minor corrections, version to appear in
Phys. Rev.
Scales, Couplings Revisited and Low Energy Phenomenology in M-theory on
We revisit the eleven dimension Planck scale, the physical scale of the
eleventh dimension, the physical scale of Calabi-Yau manifold and coupling in
hidden sector in M-theory on . And we discuss the reasonable bound on
them. Considering F-term of dilaton and moduli SUSY breaking and choosing two
repersentative points which correspond to scalar quasi-massless scenario and
dilaton dominant SUSY breaking scenario respectively, we analyze experimental
constraints to the parameter space. The sparticle spectrum and some
phenomenological predictions are also given.Comment: 35 pages and 8 eps files. One error on fig1b is correcte
An optimized QoS scheme for IMS-NEMO in heterogeneous networks
The network mobility (NEMO) is proposed to support the mobility management when users move as a whole. In IP Multimedia Subsystem (IMS), the individual Quality of Service (QoS) control for NEMO results in excessive signaling cost. On the other hand, current QoS schemes have two drawbacks: unawareness of the heterogeneous wireless environment and inefficient utilization of the reserved bandwidth. To solve these problems, we present a novel heterogeneous bandwidth sharing (HBS) scheme for QoS provision under IMS-based NEMO (IMS-NEMO). The HBS scheme selects the most suitable access network for each session and enables the new coming non-real-time sessions to share bandwidth with the Variable Bit Rate (VBR) coded media flows. The modeling and simulation results demonstrate that the HBS can satisfy users' QoS requirement and obtain a more efficient use of the scarce wireless bandwidth
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