African University of Science and Technology: Recent submissions

Now showing items 1501-1520 of 4824

  • On the GL$_{n}$-eigenvariety and a conjecture of Venkatesh 

    Hansen, D; Thorne, Jack Arfon
    Let π be a cuspidal, cohomological automorphic representation of GL$_{n}$(A). Venkatesh has suggested that there should exist a natural action of the exterior algebra of a certain motivic cohomology group on the π-part of ...

  • Infinitely many monotone Lagrangian tori in del Pezzo surfaces 

    Ferreira de Velloso Vianna, Renato
    We construct almost toric fibrations (ATFs) on all del Pezzo surfaces, endowed with a monotone symplectic form. Except for CP$^{2}$#CP$^{2}$, CP$^{2}$#2CP$^{2}$, we are able to get almost toric base diagrams (ATBDs) of ...

  • Oort: User-Centric Cloud Storage with Global Queries 

    Unknown author (2016-12-08)
    In principle, the web should provide the perfect stage for user-generated content, allowing users to share their data seamlessly with other users across services and applications. In practice, the web fragments a user's ...

  • Isoscalar ππ Scattering and the σ Meson Resonance from QCD 

    Briceño, RA; Dudek, JJ; Edwards, RG; Wilson, David John (American Physical SocietyPhysical Review Letters, 2017-01-13)
    We present for the first time a determination of the energy dependence of the isoscalar ππ elastic scattering phase shift within a first-principles numerical lattice approach to QCD. Hadronic correlation functions are ...

  • Kinetic effects regularize the mass-flux singularity at the contact line of a thin evaporating drop 

    Saxton, Matthew; Vella, D; Whiteley, JP; Oliver, JM
    We consider the transport of vapour caused by the evaporation of a thin, axisymmetric, partially wetting drop into an inert gas. We take kinetic effects into account through a linear constitutive law that states that the ...

  • Parameterization of Frontal Symmetric Instabilities. I: Theory for Resolved Fronts 

    Bachman, Scott Daniel; Fox-Kemper, B; Taylor, John Ryan; Thomas, LN (ElsevierOcean Modelling, 2017-01-01)
    A parameterization is proposed for the effects of symmetric instability (SI) on a resolved front. The parameterization is dependent on external forcing by surface buoyancy loss and/or down-front winds, which reduce potential ...

  • Zonal flow evolution and overstability in accretion discs 

    Vanon, Riccardo; Ogilvie, Gordon Ian (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-04-01)
    This work presents a linear analytical calculation on the stability and evolution of a compressible, viscous self-gravitating (SG) Keplerian disc with both horizontal thermal diffusion and a constant cooling time-scale ...

  • Extraction of gravitational-wave energy in higher dimensional numerical relativity using the Weyl tensor 

    Cook, WG; Sperhake, Ulrich
    © 2017 IOP Publishing Ltd. Gravitational waves are one of the most important diagnostic tools in the analysis of strong-gravity dynamics and have been turned into an observational channel with LIGO's detection of GW150914. ...

  • Meson spectroscopy, resonances and scattering on the lattice 

    Thomas, Christopher Edward
    I discuss some recent progress in studying the spectra of mesons using first-principles lattice QCD calculations. In particular, I highlight some new results on resonances, near-threshold states and related scattering ...

  • The Planar Ising Model and Total Positivity 

    Lis, Marcin (SpringerJournal of Statistical Physics, 2017-01-01)
    A matrix is called totally positive (resp. totally nonnegative) if all its minors are positive (resp. nonnegative). Consider the Ising model with free boundary conditions and no external field on a planar graph G. Let ...

  • Excited and exotic charmonium, $\textit{D}$$_{s}$ and $\textit{D}$ meson spectra for two light quark masses from lattice QCD 

    Cheung, Gavin; O'Hara, C; Moir, Graham; Peardon, M; Ryan, SM; Thomas, Christopher Edward; Tims, D (SpringerJournal of High Energy Physics, 2016-12-19)
    We present highly-excited charmonium, $\textit{D}$$_{s}$ and $\textit{D}$ meson spectra from dynamical lattice QCD calculations with light quarks corresponding to $\textit{M}$$_{π}$ ∼ 240 MeV and compare these to previous ...

  • Non-abelian 3$D$ bosonization and quantum Hall states 

    Radičević, Ð; Tong, David; Turner, Carl (SpringerJournal of High Energy Physics, 2016-12-01)
    Bosonization dualities relate two different Chern-Simons-matter theories, with bosonic matter on one side replaced by fermionic matter on the other. We first describe a more general class of non-Abelian bosonization ...

  • Can phoretic particles swim in two dimensions? 

    Sondak, D; Hawley, C; Heng, S; Vinsonhaler, R; Lauga, Eric Jean-Marie; Thiffeault, J-L (American Physical SocietyPhysical Review E, 2016-12-16)
    Artificial phoretic particles swim using self-generated gradients in chemical species (self-diffusiophoresis) or charges and currents (self-electrophoresis). These particles can be used to study the physics of collective ...

  • Derivative of the standard $p$-adic $L$-function associated with a Siegel form 

    Rosso, Giovanni
    In this paper we construct a two variables p-adic L-function for the standard representation associated with a Hida family of parallel weight genus g Siegel forms, using a method previously developed by B\"ocherer--Schmidt ...

  • Shadows of Teichmüller Discs in the Curve Graph 

    Tang, R; Webb, Richard Charles
    We consider several natural sets of curves associated to a given Teichmüller disc, such as the systole set or cylinder set, and study their coarse geometry inside the curve graph. We prove that these sets are quasiconvex ...

  • Helical propulsion in shear-thinning fluids 

    Gómez, S; Godínez, FA; Lauga, Eric Jean-Marie; Zenit, R (Cambridge University PressJournal of Fluid Mechanics, 2017-02-01)
    Swimming micro-organisms often have to propel themselves in complex non-Newtonian fluids. We carry out experiments with self-propelling helical swimmers driven by an externally rotating magnetic field in shear-thinning ...

  • An upper bound for the pseudoisotopy stable range 

    Randal-Williams, Oscar (SpringerMathematische Annalen, 2017-08-01)
    We prove that the pseudoisotopy stable range for manifolds of dimension 2n can be no better than (2n - 2). In order to do so, we define new characteristic classes for block bundles, extending our earlier work with Ebert, ...

  • Long-range interactions, wobbles, and phase defects in chains of model cilia 

    Brumley, DR; Bruot, N; Kotar, Jurij; Goldstein, Raymond Ethan; Cicuta, Pietro; Polin, M (American Physical SoceityPhysical Review Fluids, 2016-12-13)
    Eukaryotic cilia and flagella are chemo-mechanical oscillators capable of generating long-range coordinated motions known as metachronal waves. Pair synchronization is a fundamental requirement for these collective dynamics, ...

  • Microscale flow dynamics of ribbons and sheets 

    Montenegro-Johnson, TD; Koens, Lyndon Mathijs; Lauga, Eric Jean-Marie (Royal Society of ChemistrySoft Matter, 2017-01-18)
    Numerical study of the hydrodynamics of thin sheets and ribbons presents difficulties associated with resolving multiple length scales. To circumvent these difficulties, asymptotic methods have been developed to describe ...

  • Teichmüller spaces and bounded symmetric domains do not mix isometrically 

    Antonakoudis, Stergios (SpringerGeometric and Functional Analysis, 2017-06-01)
    This paper shows that, in dimensions two or more, there are no holomorphic isometries between Teichüller spaces and bounded symmetric domains in their intrinsic Kobayashi metric.