We show that the 3D charged Banados-Teitelboim-Zanelli (BTZ) black hole solution interpolates between two different 2D AdS spacetimes: a near-extremal, nearhorizon AdS 2 geometry with constant dilaton and U(1) field and an asymptotic AdS 2 geometry with a linear dilaton. Thus, the charged BTZ black hole can be considered as interpolating between the two different formulations proposed until now for AdS 2 quantum gravity. In both cases the theory is the chiral half of a 2D CFT and describes, respectively, Brown-Hennaux-like boundary deformations and near-horizon excitations. The central charge c as of the asymptotic CFT is determined by 3D Newton constant G and the AdS length l, c as = 3l/G, whereas that of the near-horizon CFT also depends on the U(1) charge Q, c nh ∝ lQ/ √ G.
A high data transfer rate is constantly demanded for optical disk drives. One of the solutions is to rotate a disk at a high rotational speed. We need a stable rotation of optical disks and a robust servo control to realize high-rotation-speed optical disk drives. It is difficult to rotate conventional polycarbonate optical disks, whose thickness is 1.2 mm, over 15000 rpm without vibrations. We measured and analyzed disk vibrations at high rotational speeds, and found a condition for suppressing the vibrations of the disks. We confirmed the stable rotation without vibrations up to 20000 rpm under this condition. We also conducted an experiment on tracking servo control at high rotational speeds. We used a double-boosted high-gain servo controller to suppress disturbances at high rotational speeds, and confirmed the robust servo control at 21000 rpm with this controller. #
In this article we describe simulations of Higgs boson production via the gluon fusion and Higgs-strahlung processes, using the positive weight next-to-leadingorder (NLO) matching scheme, POWHEG, in the Herwig++ 2.3 event generator. This formalism consistently incorporates the full NLO corrections to these processes within the parton shower simulation, without the production of negative weight events. These simulations include a full implementation of the truncated shower required to correctly model soft emissions in an angular-ordered parton shower. We present a thorough validation of these simulations, comparing them to other methods and calculations. The results obtained for the gluon fusion process corroborate, and provide detailed explanations for, findings reported by Alioli et al using an independent POWHEG simulation, neglecting truncated shower effects, released at the same time as our code.
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