778 citations
- Scottish Universities Physics AllianceGB34 papers
- University of CambridgeGB34 papers
- Centre National de la Recherche ScientifiqueFR33 papers
- Isaac Newton GroupES23 papers
- Institute of AstronomyRU21 papers
- University of ExeterGB21 papers
- University of LeicesterGB21 papers
- Keele UniversityGB20 papers
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- The Open UniversityGB18 papers
325 papers
Groups that together with any transformation generate regular semigroups or idempotent generated semigroups
Joao Araujo, J. D. Mitchell, Csaba Schneider
Let be a non-invertible transformation of a finite set and let be a group of permutations on that same set. Then $\genset{G, a}\setminus G$ is a subsemigroup, consisting of…
An Extension of the Theory of Kinematic MHD Models of Collapsing Magnetic Traps to 2.5D with shear flow and to 3D
Keith J. Grady, Thomas Neukirch
Context: During solar flares a large number of charged particles are accelerated to high energies, but the exact mechanism responsible for this is, so far, still unclear. Accelerat…
Perfect imaging without negative refraction
Ulf Leonhardt
Perfect imaging has been believed to rely on negative refraction, but here we show that an ordinary positively-refracting optical medium may form perfect images as well. In particu…
On the emergence of toroidal flux tubes: general dynamics and comparisons with the cylinder model
D. MacTaggart, A. W. Hood
In this paper we study the dynamics of toroidal flux tubes emerging from the solar interior, through the photosphere and into the corona. Many previous theoretical studies of flux…
Kinematics at the Edge of the Galactic Bulge: Evidence for Cylindrical Rotation
Christian D. Howard, R. Michael Rich, Will Clarkson +9
We present new results from BRAVA, a large scale radial velocity survey of the Galactic bulge, using M giant stars selected from the Two Micron All Sky Survey catalogue as targets…
Substellar Objects in Nearby Young Clusters (SONYC): The bottom of the Initial Mass Function in NGC1333
Alexander Scholz, Vincent Geers, Ray Jayawardhana +4
SONYC -- Substellar Objects in Nearby Young Clusters -- is a survey program to investigate the frequency and properties of substellar objects with masses down to a few times that o…