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On dust–gas gravitational instabilities in protoplanetary discs
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-01-11)
In protoplanetary discs the aerodynamical friction between particles and gas induces a variety of instabilities that facilitate planet formation. Of these we examine the so-called ‘secular gravitational instability’ (SGI) ...
Bioinspired trailing-edge noise control
(American Institute of Aeronautics and AstronauticsAIAA Journal, 2017-01-01)
Strategies for trailing edge noise control have been inspired by the downy canopy that covers the surface of exposed flight feathers of many owl species. Previous wind tunnel measurements demonstrate that canopies of similar ...
Pattern formation in chemically interacting active rotors with self-propulsion
(Royal Society of ChemistrySoft Matter, 2016-09-21)
We demonstrate that active rotations in chemically signalling particles, such as autochemotactic $\textit{E. coli}$ close to walls, create a route for pattern formation based on a nonlinear yet deterministic instability ...
Universal diffusion in incoherent black holes
(American Physical SocietyPhysical Review D, 2016-10-31)
We study charge and energy diffusion in simple holographic theories with broken translational symmetry. We find that when the effects of momentum relaxation are very strong the diffusion constants take universal values ...
Nonconvexity of private capacity and classical environment-assisted capacity of a quantum channel
(American Physical SocietyPhysical Review A, 2016-10-17)
The capacity of classical channels is convex. This is not the case for the quantum capacity of a channel: The capacity of a mixture of different quantum channels exceeds the mixture of the individual capacities and thus ...
Low- and high-frequency oscillatory winds synergistically enhance nutrient entrainment and phytoplankton at fronts
(AGU PublicationsJournal of Geophysical Research: Oceans, 2017-02-10)
When phytoplankton growth is limited by low nutrient concentrations, full-depth-integrated phytoplankton biomass increases in response to intermittent mixing events that bring nutrient-rich waters into the sunlit surface ...
Viscoplastic boundary layers
(Cambridge University PressJournal of Fluid Mechanics, 2017-02-25)
In the limit of a large yield stress, or equivalently at the initiation of motion, viscoplastic flows can develop narrow boundary layers that provide either surfaces of failure between rigid plugs, the lubrication between ...
Nonthermal fixed points in quantum field theory beyond the weak-coupling limit
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-02-22)
Quantum systems in extreme conditions can exhibit universal behavior far from equilibrium associated to nonthermal fixed points with a wide range of topical applications from early-Universe inflaton dynamics and heavy-ion ...
Geometric tuning of self-propulsion for Janus catalytic particles
(Nature Publishing GroupScientific Reports, 2017-02-13)
Catalytic swimmers have attracted much attention as alternatives to biological systems for examining collective microscopic dynamics and the response to physico-chemical signals. Yet, understanding and predicting even the ...
Dynamical symmetries in Brans-Dicke cosmology
(American Physical SocietyPhysical Review D, 2017-01-20)
In the context of generalized Brans-Dicke cosmology we use the Killing tensors of the minisuperspace in order to determine the unspecified potential of a scalar-tensor gravity theory. Specifically, based on the existence ...