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Stochastic cycle selection in active flow networks
(National Academy of Sciences of the USAProceedings of the National Academy of Sciences, 2016)
Active biological flow networks pervade nature and span a wide
range of scales, from arterial blood vessels and bronchial mucus
transport in humans to bacterial flow through porous media or
plasmodial shuttle streaming in ...
Directed collective motion of bacteria under channel confinement
(Institute of PhysicsNew Journal of Physics, 2016-07-01)
Dense suspensions of swimming bacteria are known to exhibit collective behaviour arising from the
interplay of steric and hydrodynamic interactions. Unconfined suspensions exhibit transient,
recurring vortices and jets, ...
Tunnelling effects for acoustic waves in slowly varying axisymmetric flow ducts
(ElsevierJournal of Sound and Vibration, 2016-06-22)
The multiple-scales Wentzel–Kramers–Brillouin (WKB) approximation is used to model the propagation of acoustic waves in an axisymmetric duct with a constriction in the presence of mean flow. An analysis of the reflection ...
PRECESSION: Dynamics of spinning black-hole binaries with python
(American Physical SocietyPhysical Review D, 2016-06-27)
We present the numerical code precession, a new open-source python module to study the dynamics of precessing black-hole binaries in the post-Newtonian regime. The code provides a comprehensive toolbox to (i) study the ...
How far from equilibrium is active matter?
(American Physical SocietyPhysical Review Letters, 2016)
Active matter systems are driven out of thermal equilibrium by a lack of generalized Stokes-Einstein relation between injection and dissipation of energy at the microscopic scale. We consider such a system of interacting ...
Non-trivial Phase Coupling in Polariton Multiplets
(American Physical SocietyPhysical Review X, 2016)
We investigate the phase coupling between spatially separated polariton condensates under non-resonant optical pulsed excitation. In the simple case of two condensates, we observe phase locking either in symmetric or ...
Instabilities and Solitons in Minimal Strips
(American Physical SocietyPhysical Review Letters, 2016-07-01)
We show that highly twisted minimal strips can undergo a nonsingular transition, unlike the singular transitions seen in the Möbius strip and the catenoid. If the strip is nonorientable, this transition is topologically ...
Black Hole Kicks as New Gravitational Wave Observables
(American Physical SocietyPhysical Review Letters, 2016-06-29)
Generic black hole binaries radiate gravitational waves anisotropically, imparting a recoil, or kick, velocity to the merger remnant. If a component of the kick along the line of sight is present, gravitational waves emitted ...
Higher symmetries of the Schrödinger operator in Newton–Cartan geometry
(ElsevierJournal of Geometry and Physics, 2016-06-17)
We establish several relationships between the non-relativistic conformal symmetries of Newton–Cartan geometry and the Schrödinger equation. In particular we discuss the algebra sch(d) of vector fields conformally-preserving ...
Preconditioned ADMM with nonlinear operator constraint
(SpringerIFIP Advances in Information and Communication Technology, 2016)
We are presenting a modification of the well-known Alternating Direction Method of Multipliers (ADMM) algorithm with additional preconditioning that aims at solving convex optimisation problems with nonlinear operator ...