Open Access Repositories: Recent submissions
Now showing items 281-300 of 4204
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Classical and quantum solutions in Brans-Dicke cosmology with a perfect fluid
(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 ...
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Slender-ribbon theory
(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 ...
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Separable projection integrals for higher-order correlators of the cosmic microwave sky: Acceleration by factors exceeding 100
(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 ...
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ATLAS diboson excess could be an R-parity violating dismuon excess
(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 ...
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Stability of saddle points via explicit coderivatives of pointwise subdifferentials
(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. ...
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Linear and nonlinear wave propagation in booming sand dunes
(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, ...
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On superconformal anyons
(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 ...
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Acoustic Scattering by a Finite Rigid Plate with a Poroelastic Extension
(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 ...
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Three-dimensional flow in Kupffer's Vesicle
(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 ...
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Using stratification to mitigate end-effects in quasi-Keplerian Taylor-Couette flow
(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 ...
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Gravity-dominated unequal-mass black hole collisions
(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 ...
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Twistors and the massive spinning particle
(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 ...
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Motility of Colonial Choanoflagellates and the Statistics of Aggregate Random Walkers
(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 ...
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Exploiting the Feller Coupling for the Ewens Sampling Formula
(Institute of Mathematical StatisticsStatistical Science, 2016-02-10)
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Convective mass transfer from a submerged drop in a thin falling film
(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 ...
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Periodization, translation, prescription and the emergence of Classical French
(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 ...
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The synthesis of di-carboxylate esters using continuous flow vortex fluidics
(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 ...
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Vortices and Monopoles in a Harmonic Trap
(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 ...