Search
Now showing items 841-850 of 1390
Cyclic mixmaster universes
(American Physical SocietyPhysical Review D, 2017-04-19)
We investigate the behavior of bouncing Bianchi type IX “mixmaster” universes in general relativity. This generalizes all previous studies of the cyclic behavior of closed spatially homogeneous universes with and without ...
On the local well-posedness of Lovelock and Horndeski theories
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmologyhttp://dx.doi.org/10.1103/PhysRevD.96.044019, 2017-08-15)
We investigate local well-posedness of the initial value problem for Lovelock and Horndeski theories of gravity. A necessary condition for local well-posedness is strong hyperbolicity of the equations of motion. Even weak ...
Tachyons in the Galilean limit
(SpringerJournal of High Energy Physics, 2017-04-20)
The Souriau massless Galilean particle of “colour” k and spin s is shown to be the Galilean limit of the Souriau tachyon of mass m = ik and spin s. We compare and contrast this result with the Galilean limit of the Nambu-Goto ...
Graviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory
(Journal of High Energy Physics, 2015-11-17)
The Evolution of a Supermassive Retrograde Binary Embedded in an Accretion Disk
(Open Astronomy, 2015-01-01)
Analytical solutions to slender-ribbon theory
(Physical Review Fluids, 2017-08-01)
Synoptic-to-planetary scale wind variability enhances phytoplankton biomass at ocean fronts
(American Geophysical UnionJournal of Geophysical Research: Oceans, 2017-06-01)
In nutrient-limited conditions, phytoplankton growth at fronts is enhanced by winds, which drive upward nutrient fluxes via enhanced turbulent mixing and upwelling. Hence, depth-integrated phytoplankton biomass can be 10 ...
Conditional sampling of a high Péclet number turbulent plume and the implications for entrainment
(Cambridge University PressJournal of Fluid Mechanics, 2017-07-25)
We present simultaneous two-dimensional velocity and scalar measurements on a central vertical plane in an axisymmetric pure turbulent plume. We use an edge-detection algorithm to determine the edge of the plume, and compare ...
Efficient boundary integral solution for acoustic wave scattering by irregular surfaces
(ElsevierEngineering Analysis with Boundary Elements, 2017-10-01)
The left–right operator splitting method is studied for the efficient calculation of acoustic fields scattered by arbitrary rough surfaces. Here, the governing boundary integral is written as a sum of left- and right-going ...
Stability of three-dimensional columnar convection in a porous medium
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-25)
The stability of steady convective exchange flow with a rectangular planform in an unbounded three-dimensional porous medium is explored. The base flow comprises a balance between vertical advection with amplitude A in ...