5,410 research outputs found

    Topologically massive gravity as a Pais-Uhlenbeck oscillator

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    We give a detailed account of the free field spectrum and the Newtonian limit of the linearized "massive" (Pauli-Fierz), "topologically massive" (Einstein-Hilbert-Chern-Simons) gravity in 2+1 dimensions about a Minkowski spacetime. For a certain ratio of the parameters, the linearized free theory is Jordan-diagonalizable and reduces to a degenerate "Pais-Uhlenbeck" oscillator which, despite being a higher derivative theory, is ghost-free.Comment: 9 pages, no figures, RevTEX4; version 2: a new paragraph and a reference added to the Introduction, a new appendix added to review Pais-Uhlenbeck oscillators; accepted for publication in Class. Quant. Gra

    Controle de cancro-do-enxerto (Lasiodiplodia theobromae (Pat) Griff & Maubl em seringueira utilizando-se a técnica do plantio profundo.

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    bitstream/item/40149/1/Circ-Teec-73-CPATU.pd

    Shadowing by non uniformly hyperbolic periodic points and uniform hyperbolicity

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    We prove that, under a mild condition on the hyperbolicity of its periodic points, a map gg which is topologically conjugated to a hyperbolic map (respectively, an expanding map) is also a hyperbolic map (respectively, an expanding map). In particular, this result gives a partial positive answer for a question done by A. Katok, in a related context

    Efeito de extratos de plantas sobre a mortalidade de ninfas de Bemisia tabaci (Genn.) biótipo B (Hemiptera: Aleyrodidae) em feijoeiro (Phaseolus vulgaris L.).

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    Neste trabalho, avaliou-se o efeito do nim indiano, fumo, arruda e açafrão sobre a mortalidade de ninfas de B. tabaci biótipo B, em casa de vegetação.bitstream/CNPAF/23009/1/comt_95.pd
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