147,323 research outputs found

    Chistopher Tuplin. Xenophon and Achaemenid Courts: A Survey of Evidence

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    L’approche de CT est aussi bien documentĂ©e mais plus conventionnelle que celle de R. Bichler (c.r. n° 36). L’A. dĂ©bute par une analyse du vocabulaire ayant trait Ă  l’Empire achĂ©mĂ©nide dans les Ɠuvres de XĂ©nophon. Il en dĂ©coule que XĂ©nophon n’a pas de notions prĂ©cises de l’empire achĂ©mĂ©nide. Ni les paysages, ni les villes, ni leurs palais ne sont dĂ©crits en dĂ©tail. La vie aulique se base selon lui plus sur l’honneur et la performance que sur l’origine. En tout, l’apport de XĂ©nophon pour une co..

    « Das Phantom des Medischen ‘Grossreiches’ und die Behistun-Inschrift », in : E. Dąbrowa, ed., Ancient Iran and its neighbours. Studies in Honour of Prof. Jozef Wolski on Occasion of His 95th Birthday. Krakow, 2005, pp. 11-29. (Electrum 10)

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    L’A. poursuit sa critique de la rĂ©alitĂ© d’un empire mĂšde (Abs. Ir. 26, c.r. n° 117). Il rĂ©sume les arguments : pas d’archives internes ni de capitale, ni de documents archĂ©ologiques et d’art. Les sources externes (assyriennes et babyloniennes), par la terminologie qualifiant les MĂšdes, n’indiquent pas l’existence d’un État. Il ne reste que le texte d’HĂ©rodote. Puis, R.R. s’appuie sur la fameuse inscription de Behistun dans laquelle l’opposition mĂšde Ă  Darius n’indique nullement une unitĂ© rĂ©ce..

    Explicit BCJ Numerators from Pure Spinors

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    We derive local kinematic numerators for gauge theory tree amplitudes which manifestly satisfy Jacobi identities analogous to color factors. They naturally emerge from the low energy limit of superstring amplitudes computed with the pure spinor formalism. The manifestation of the color--kinematics duality is a consequence of the superstring computation involving no more than (n-2)! kinematic factors for the full color dressed n-point amplitude. The bosonic part of these results describe gluon scattering independent on the number of supersymmetries and captures any N^kMHV helicity configuration after dimensional reduction to D=4 dimensions.Comment: 32 pages, harvma

    Six Open String Disk Amplitude in Pure Spinor Superspace

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    The tree-level amplitude of six massless open strings is computed using the pure spinor formalism. The OPE poles among integrated and unintegrated vertices can be efficiently organized according to the cohomology of pure spinor superspace. The identification and use of these BRST structures and their interplay with the system of equations fulfilled by the generalized Euler integrals allow the full supersymmetric six-point amplitude to be written in compact form. Furthermore, the complete set of extended Bern-Carrasco-Johansson relations are derived from the monodromy properties of the disk world-sheet and explicitly verified for the supersymmetric numerator factors.Comment: 44pp, harvmac; v2: Final version to appear in NP

    Large Cyclic Subgroups of Jacobians of Hyperelliptic Curves

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    In this paper we obtain conditions on the divisors of the group order of the Jacobian of a hyperelliptic genus 2 curve, generated by the complex multiplication method described by Weng (2003) and Gaudry (2005). Examples, where these conditions imply that the Jacobian has a large cyclic subgroup, are given.Comment: 8 pages, 1 figur

    The absorption and emission spectrum of the magnetic Herbig Ae star HD 190073

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    We determine abundances from the absorption spectrum of the magnetic Herbig Ae star HD 190073 (V1295 Aql). The observations are primarily from HARPS spectra obtained at a single epoch. We accept arguments that the presence of numerous emission lines does not vitiate a classical abundance analysis, though it likely reduces the achievable accuracy. Most abundances are closely solar, but several elements show departures of a factor of two to three, as an earlier study has also shown. We present quantitative measurements of more than 60 emission lines, peak intensities, equivalent widths, and FWHM's. The latter range from over 200 km/s (H-alpha, He D3) down to 10--20 km/s (forbidden lines). Metallic emission lines have intermediate widths. We eschew modeling, and content ourselves with a presentation of the observations a successful model must explain. Low-excitation features such as the Na I D-lines and [O I] appear with He I D3, suggesting proximate regions with widely differing Te and Ne as found in the solar chromosphere. The [O I] and [Ca II] lines show sharp, violet-shifted features. Additionally, [Fe II] lines appear to be weakly present in emission.Comment: 7 pages, 10 figures. To appear in Astronomische Nachrichten, Proceedings of the 7th Potsdam Thinkshop on "Magnetic Fields in Stars and Exoplanets.

    Coupled-channels analyses for large-angle quasi-elastic scattering in massive systems

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    We discuss in detail the coupled-channels approach for the large-angle quasi-elastic scattering in massive systems, where many degrees of freedom may be involved in the reaction. We especially investigate the effects of single, double and triple phonon excitations on the quasi-elastic scattering for 48^{48}Ti,54^{54}Cr,56^{56}Fe,64^{64}Ni and 70^{70}Zn+208+^{208}Pb systems, for which the experimental cross sections have been measured recently. We show that the present coupled-channels calculations well account for the overall width of the experimental barrier distribution for these systems. In particular, it is shown that the calculations taking into account single quadrupole phonon excitations in 48^{48}Ti and triple octupole phonon excitations in 208^{208}Pb reasonably well reproduce the experimental quasi-elastic cross section and barrier distribution for the 48^{48}Ti+208+^{208}Pb reaction. On the other hand, 54^{54}Cr,56^{56}Fe,64^{64}Ni and 70^{70}Zn+208+^{208}Pb systems seem to require the double quadrupole phonon excitations in the projectiles in order to reproduce the experimental data.Comment: 11 pages, 6 figure
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