Open Access Repositories: Recent submissions

Now showing items 281-300 of 4204

  • Classical and quantum solutions in Brans-Dicke cosmology with a perfect fluid 

    Paliathanasis, Andronikos; Tsamparlis, Michael; Basilakos, Spyros; Barrow, John David (American Physical SocietyPhysical Review D, 2016)
    We consider the application of group invariant transformations in order to constrain a flat isotropic and homogeneous cosmological model, containing of a Brans-Dicke scalar field and a perfect fluid with a constant equation ...

  • Slender-ribbon theory 

    Koens, Lyndon Mathijs; Lauga, Eric Jean-Marie (American Institute of PhysicsPhysics of Fluids, 2016-01-11)
    Ribbons are long narrow strips possessing three distinct material length scales (thickness, width, and length) which allow them to produce unique shapes unobtainable by wires or filaments. For example, when a ribbon has ...

  • Separable projection integrals for higher-order correlators of the cosmic microwave sky: Acceleration by factors exceeding 100 

    Briggs, JP; Pennycook, SJ; Fergusson, James Robert; Jäykkä, J; Shellard, Edward Paul (ElsevierJournal of Computational Physics, 2016-01-19)
    We present a case study describing efforts to optimise and modernise “Modal”, the simulation and analysis pipeline used by the Planck satellite experiment for constraining general non-Gaussian models of the early universe ...

  • ATLAS diboson excess could be an R-parity violating dismuon excess 

    Allanach, Benjamin Christopher; Dev, PS Bhupal; Sakurai, Kazuki (American Physical SocietyPhysical Review D, 2016-02-09)
    We propose a new possible explanation of the ATLAS diboson excess: that it is due to heavy resonant slepton production, followed by decay into dismuons. The smuon has a mass not too far from the W and Z masses, and so it ...

  • Stability of saddle points via explicit coderivatives of pointwise subdifferentials 

    Clason, Christian; Valkonen, Tuomo (Springer, 2016)
    We derive stability criteria for saddle points of a class of nonsmooth optimization problems in Hilbert spaces arising in PDE-constrained optimization, using metric regularity of infinite-dimensional set-valued mappings. ...

  • Linear and nonlinear wave propagation in booming sand dunes 

    Vriend, Nathalie Maria; Hunt, ML; Clayton, RW (AIPPhysics of Fluids, 2015-10-27)
    The current field study examines linear and non-linear acoustic waves found in large desert sand dunes using field measurements of wave speed, frequency content, dispersion, and polarization. At the dune fields visited, ...

  • On superconformal anyons 

    Doroud, Nima; Tong, David; Turner, Carl (SpringerJournal of High Energy Physics, 2016-01-22)
    In d = 2+1 dimensions, there exist field theories which are non-relativistic and superconformal. These theories describe two species of anyons, whose spins differ by 1/2, interacting in a harmonic trap. We compute the ...

  • Acoustic Scattering by a Finite Rigid Plate with a Poroelastic Extension 

    Ayton, Lorna Jane (Cambridge University PressJournal of Fluid Mechanics, 2016-02-24)
    The scattering of sound by a finite rigid plate with a finite poroelastic extension interacting with an unsteady acoustic source is investigated to determine the effects of porosity, elasticity, and the length of the ...

  • Research data supporting "Diffusion tensor imaging with deterministic error bounds" 

    Gorokh, Artur; Korolev, Yury; Valkonen, Tuomo (2016-01-22)

  • Three-dimensional flow in Kupffer's Vesicle 

    Montenegro-Johnson, Thomas Douglas; Baker, DI; Smith, DJ; Lopes, SS (SpringerJournal of Mathematical Biology, 2016-01-29)
    Whilst many vertebrates appear externally left-right symmetric, the arrangement of internal organs is asymmetric. In zebrafish, the breaking of left-right symmetry is organised by Kupffer’s Vesicle (KV): an approximately ...

  • Using stratification to mitigate end-effects in quasi-Keplerian Taylor-Couette flow 

    Leclercq, Colin; Partridge, Jamie L; Augier, Pierre; Dalziel, Stuart Bruce; Kerswell, Richard Rodney (Cambridge University PressJournal of Fluid Mechanics, 2016-02-24)
    Efforts to model accretion disks in the laboratory using Taylor–Couette flow apparatus are plagued with problems due to the substantial impact the end-plates have on the flow. We explore the possibility of mitigating the ...

  • Research data supporting: "Using stratification to mitigate end-effects in quasi-Keplerian Taylor-Couette flow" 

    Leclercq, Colin; Partridge, Jamie. L.; Augier, Pierre; Dalziel, Stuart B.; Kerswell, Rich. R. (2016-01-19)

  • Gravity-dominated unequal-mass black hole collisions 

    Sperhake, Ulrich; Berti, Emanuele; Cardoso, Vitor; Pretorius, Frans (APSPhysical Review D, 2016-02-04)
    We continue our series of studies of high-energy collisions of black holes investigating unequalmass, boosted head-on collisions in four dimensions. We show that the fraction of the center-of-mass energy radiated as ...

  • Twistors and the massive spinning particle 

    Mezincescu, Luca; Routh, Alasdair J; Townsend, Paul Kingsley (IOP ScienceJournal of Physics A: Mathematical and Theoretical, 2015-12-07)
    Gauge-invariant twistor variables are found for the massive spinning particle with N-extended local worldline supersymmetry, in spacetime dimensions D = 3, 4, 6. The twistor action is manifestly Lorentz invariant but the ...

  • Motility of Colonial Choanoflagellates and the Statistics of Aggregate Random Walkers 

    Kirkegaard, Julius Bier; Marron, Alan Oliver; Goldstein, Raymond Ethan (American Physical SocietyPhysical Review Letters, 2016-01-22)
    We illuminate the nature of the three-dimensional random walks of microorganisms composed of individual organisms adhered together. Such aggregate random walkers are typified by choanoflagellates, eukaryotes that are the ...

  • Exploiting the Feller Coupling for the Ewens Sampling Formula 

    Arratia, Richard; Barbour, AD; Tavaré, Simon (Institute of Mathematical StatisticsStatistical Science, 2016-02-10)

  • Convective mass transfer from a submerged drop in a thin falling film 

    Landel, Julien R; Thomas, AL; McEvoy, H; Dalziel, Stuart Bruce (Cambridge University PressJournal of Fluid Mechanics, 2016-01-25)
    We study the fluid mechanics of removing a passive tracer contained in small, viscous drops attached to a flat inclined substrate using thin gravity-driven film flows. A convective mass transfer establishes across the ...

  • Periodization, translation, prescription and the emergence of Classical French 

    Ayres-Bennett, Wendy Margaret; Caron, Philippe (WileyTransactions of the Philological Society, 2016-03-17)
    In this article we demonstrate how fine-grained analysis of salient features of linguistic change over a relatively short, but significant period can help refine our notions of periodization. As our case study, we consider ...

  • The synthesis of di-carboxylate esters using continuous flow vortex fluidics 

    Britton, Joshua; Dalziel, Stuart Bruce; Raston, Colin L (Royal Society of ChemistryGreen Chemistry, 2015-12-01)
    A vortex fluidic device (VFD) is effective in mediating the synthesis of di-esters at room temperature. Processing under ambient conditions allows for a simple and efficient synthesis, whilst operating under continuous ...

  • Vortices and Monopoles in a Harmonic Trap 

    Tong, David; Turner, Carl (SpringerJournal of High Energy Physics, 2015-12-15)
    The Ω-deformation is a harmonic trap, penning certain excitations near the origin in a manner consistent with supersymmetry. Here we explore the dynamics of BPS monopoles and vortices in such a trap. We pay particular ...