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Metrisability of three-dimensional path geometries
(SpringerEuropean Journal of Mathematics, 2016-03-08)
Given a projective structure on a three-dimensional manifold, we find explicit obstructions to the local existence of a Levi-Civita connection in the projective class. These obstructions are given by projectively invariant ...
Sensing in the Mouth: A Model for Filiform Papillae as Strain Amplifiers
(FrontiersFrontiers in Physics, 2016-08-23)
Texture perception of foods is a common yet remarkably unstudied biophysical problem. Motivated by recent experiments reporting the presence of corpuscular endings in tongue filiform papillae, we develop in this work a ...
Cosmological solutions of $\small \textit{f(T)}$ gravity
(American Physical SocietyPhysical Review D, 2016-07-28)
In the cosmological scenario in $\small \textit{f(T)}$ gravity, we find analytical solutions for an isotropic and homogeneous universe containing a dust fluid and radiation and for an empty anisotropic Bianchi I universe. ...
The Evolution of Silicon Transport in Eukaryotes
(Oxford University PressMolecular Biology and Evolution, 2016-10-11)
Biosilicification (the formation of biological structures from silica) occurs in diverse eukaryotic lineages, plays a major role in global biogeochemical cycles, and has significant biotechnological applications. Silicon ...
Temperature and density structure of a recurring active region jet
(EDP SciencesAstronomy & Astrophysics, 2016-11-08)
Aims. We present a study of a recurring jet observed on October 31, 2011 by the Atmosphereic Imaging Assembly (AIA) on board the Solar Dynamic Observatory, the X-ray Telescope (XRT) and EUV Imaging Spectrometer (EIS) on ...
On the formation of a quasi-stationary twisted disc after a tidal disruption event
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-08-24)
We investigate misaligned accretion discs formed after tidal disruption events that occur when a star encounters a supermassive black hole. We employ the linear theory of warped accretion discs to find the shape of a disc ...
Elastohydrodynamic synchronization of adjacent beating flagella
(American Physical SocietyPhysical Review Fluids, 2016-11-01)
It is now well established that nearby beating pairs of eukaryotic flagella or cilia typically synchronize in phase. A substantial body of evidence supports the hypothesis that hydrodynamic coupling between the active ...
On the energy dissipation rate at the inner edge of circumbinary discs
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-10-03)
We study, by means of numerical simulations and analysis, the details of the accretion process from a disc on to a binary system. We show that energy is dissipated at the edge of a circumbinary disc and this is associated ...
Source modelling at the dawn of gravitational-wave astronomy
(Department of Applied Mathematics and Theoretical Physics, University of CambridgeUniversity of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsDarwin College, 2016-11-08)
The age of gravitational-wave astronomy has begun. Gravitational waves are propagating spacetime perturbations ($\textit{“ripples in the fabric of space-time”}$) predicted by Einstein’s theory of General Relativity. These ...
Filter-feeding, near-field flows, and the morphologies of colonial choanoflagellates
(American Physical SocietyPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2016-11-01)
Efficient uptake of prey and nutrients from the environment is an important component in the fitness of all microorganisms, and its dependence on size may reveal clues to the origins of evolutionary transitions to ...