56,263 research outputs found

    Effects of neutrino oscillation on supernova neutrino: inverted mass hierarchy

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    We study the effects of neutrino oscillation on supernova neutrino in the case of the inverted mass hierarchy (m3m1<m2m_{3} \ll m_{1} < m_{2}) as well as the normal mass hierarchy (m1<m2m3m_{1} < m_{2} \ll m_{3}). Numerical analysis using a realistic supernova and presupernova model allows us to discuss quantitatively a possibility to probe neutrino oscillation parameters. We show that information about the mass hierarchy can be obtained if θ13\theta_{13} is rather large (sin22θ13>103\sin^{2}{2 \theta_{13}} > 10^{-3}) and that θ13\theta_{13} can be well probed by SuperKamiokande if the neutrino mass hierarchy is the inverted case. Errors due to the uncertainty of the original neutrino spectra and the Earth effect are also discussed.Comment: 13 pages, 9 figures, significantly revised. Published version in PT

    Syntomic cohomology and Beilinson's Tate conjecture for K₂

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    Magnetic Susceptibility of Quark Matter

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    Magnetic properties of quark matter is discussed by evaluating the spin susceptibility within Fermi-liquid theory. We take into account the dynamical and static screening effects. At finite temperature, an anomalous T^2 ln T term for susceptibity is shown as a non-Fermi-liquid effect due to the dynamical screening of transverse gluons.Comment: 4 pages, 2 figures, Proc. of YITP Symposium "Fundamental Problems in Hot and/or Dense QCD

    Study of K^0 \to pi^- e^+ nu_e e^+ e^- in chiral perturbation theory

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    K^0 \to pi^- e^+ nu_e e^+ e^- decay is studied up to the next-to-leading order O^4 in chiral perturbation theory. It is found that the O^4 terms appreciably modifiy the shape of the invariant mass distribution of the leptons and the energy spectrum of the neutrino.Comment: 17 pages, 7 figures, figures and formula are adde

    Determining the Supernova Direction by its Neutrinos

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    Supernova neutrinos, which arrive at Earth earlier than light, allow for the earliest determination of the direction of the supernova. The topic of this paper is to study how accurately we can determine the supernova direction. We simulate supernova neutrino events at the SuperKamiokande detector, using a realistic supernova model and several realistic neutrino oscillation models. With the results of our simulation, we can restrict the supernova direction to be within a circle of radius 99^\circ. In several neutrino oscillation models, this accuracy is increased to 88^\circ. We also discuss the influence of an accident that occurred at the SuperKamiokande detector. After repair of the detector, using the remaining PMTs, the accuracy becomes about 1212^\circ for no oscillation.Comment: 20 pages, 8 figures, Prog. Theor. Phys., accepte

    Time synchronization via the transit satellite at Mizusawa

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    Time signals emitted from Transit satellites and received by the NAVICODE type receiver at Mizusawa, Japan are presented. The International Latitude Observatory of Mizusawa and the U. S. Naval Observatory were compared using the time signals. Propagation delays, a receiver delay, effects of relative motion of satellites, and effects of the ionosphere are discussed

    Intersecting D-brane states derived from the KP theory

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    A general scheme to find tachyon boundary states is developed within the framework of the theory of KP hierarchy. The method is applied to calculate correlation function of intersecting D-branes and rederived the results of our previous works as special examples. A matrix generalization of this scheme provides a method to study dynamics of coincident multi D-branes.Comment: 10 page

    Reconstruction of the primordial fluctuation spectrum from the five-year WMAP data by the cosmic inversion method with band-power decorrelation analysis

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    The primordial curvature fluctuation spectrum is reconstructed by the cosmic inversion method using the five-year WMAP data of the cosmic microwave background temperature anisotropy. We apply the covariance matrix analysis and decompose the reconstructed spectrum into statistically independent band-powers. The statistically significant deviation from a simple power-law spectrum suggested by the analysis of the first-year data is not found in the five-year data except possibly at one point near the border of the wavenumber domain where accurate reconstruction is possible.Comment: 9page