34,650 research outputs found

    Grass-endophytes in plant protection

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    Agriculturists have long known that certain grass species infected with systemic fungal endophytes are highly resistant to both vertebrate and invertebrate herbivores

    QCD-like technicolor on the lattice

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    This talk gives an overview, aimed at non-experts, of the recent progress on the studies of technicolor models on the lattice. Phenomenologically successful technicolor models require walking coupling; thus, an emphasis is put on the determination of the beta-function of various models. As a case study we consider SU(2) gauge field theory with two adjoint representation fermions, so-called minimal walking technicolor theory.Comment: 6 pages; talk presented at "Quark Confinement and the Hadron Spectrum IX", Universidad Complutense de Madrid, 30 August--3 September 201

    Sequences with long range exclusions

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    Given an alphabet SS, we consider the size of the subsets of the full sequence space SZS^{\rm {\bf Z}} determined by the additional restriction that xixi+f(n), iZ, nN.x_i\not=x_{i+f(n)},\ i\in {\rm {\bf Z}},\ n\in {\rm {\bf N}}. Here ff is a positive, strictly increasing function. We review an other, graph theoretic, formulation and then the known results covering various combinations of ff and the alphabet size. In the second part of the paper we turn to the fine structure of the allowed sequences in the particular case where ff is a suitable polynomial. The generation of sequences leads naturally to consider the problem of their maximal length, which turns out highly random asymptotically in the alphabet size.Comment: 18 pages, 3 figures. Replaces earlier version, submission 1204.3439, major updat

    Book review

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