11,341 research outputs found

    On the exact solutions of the Bianchi IX cosmological model in the proper time

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    It has recently been argued that there might exist a four-parameter analytic solution to the Bianchi IX cosmological model, which would extend the three-parameter solution of Belinskii et al. to one more arbitrary constant. We perform the perturbative Painlev\'e test in the proper time variable, and confirm the possible existence of such an extension.Comment: 8 pages, no figure, standard Latex, to appear in Regular and chaotic dynamics (1998

    Λb\Lambda_b Decays into Λ\Lambda-Vector

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    A complete study of the angular distributions of the processes, ΛbΛV(1)\Lambda_b \to {\Lambda} V(1^-), with Λpπ\Lambda \to p {\pi}^- and V(J/Ψ)+V (J/{\Psi}) \to {\ell}^+ {\ell}^- or V(ρ0,ω)π+π,V ({\rho}^0,\omega) \to {\pi}^+ {\pi}^-, is performed. Emphasis is put on the initial Λb\Lambda_b polarization produced in the proton-proton collisions. The polarization density-matrices as well as angular distributions are derived and help to construct T-odd observables which allow us to perform tests of both Time-Reversal and CP violation.Comment: 10 pages, 2 figure

    Explaining the Price of Voluntary Carbon Offsets

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    This paper investigates factors that explain the large variability in the price of voluntary carbon offsets. We estimate hedonic price functions using a variety of provider- and project-level characteristics as explanatory variables. We find that providers located in Europe sell offsets at prices that are approximately 30 percent higher than providers located in either North America or Australasia. Contrary to what one might expect, offset prices are generally higher, by roughly 20 percent, when projects are located in developing or least-developed nations. But this result does not hold for forestry-based projects. We find evidence that forestry-based offsets sell at lower prices, and the result is particularly strong when projects are located in developing or least-developed nations. Offsets that are certified under the Clean Development Mechanism or the Gold Standard, and therefore qualify for emission reductions under the Kyoto Protocol, sell at a premium of more than 30 percent; however, third-party certification from the Voluntary Carbon Standard, one of the largest certifiers, is associated with a price discount. Variables that have no effect on offset prices are the number of projects that a provider manages and a provider’s status as for-profit or not-for-profit.

    Integration of a generalized H\'enon-Heiles Hamiltonian

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    The generalized H\'enon-Heiles Hamiltonian H=1/2(PX2+PY2+c1X2+c2Y2)+aXY2bX3/3H=1/2(P_X^2+P_Y^2+c_1X^2+c_2Y^2)+aXY^2-bX^3/3 with an additional nonpolynomial term μY2\mu Y^{-2} is known to be Liouville integrable for three sets of values of (b/a,c1,c2)(b/a,c_1,c_2). It has been previously integrated by genus two theta functions only in one of these cases. Defining the separating variables of the Hamilton-Jacobi equations, we succeed here, in the two other cases, to integrate the equations of motion with hyperelliptic functions.Comment: LaTex 2e. To appear, Journal of Mathematical Physic

    Note sur les sorghos du Nord Cameroun : Compte-rendu de tournée du 9 au 12 novembre 1965

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    Note sur l'amélioration du maïs dans l'ouest Cameroun : compte-rendu de mission du 16 au 23 juillet 1969

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    Enquête sur les sorghos et mils du Tchad. Compte-rendu de mission du 2 au 8 novembre 1965

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    A Personal Reflection on the Last Half of the First Twenty-Five Years: Approaching the Millennium

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    25th Anniversary Special Reflection Sectio

    Spaces of Freedom for Citizens and Asylees in the EU and U.S.

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    The Larynx as an Instrument of Music

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