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Numerical simulations of stellar collapse in scalar-tensor theories of gravity
(Institute of PhysicsClassical and Quantum Gravity, 2016-05-31)
We present numerical-relativity simulations of spherically symmetric core collapse and compact-object formation in scalar-tensor theories of gravity. The additional scalar degree of freedom introduces a propagating monopole ...
On turbulence driven by axial precession and tidal evolution of the spin–orbit angle of close-in giant planets
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-05-16)
The spin axis of a rotationally deformed planet is forced to precess about its orbital angular momentum vector, due to the tidal gravity of its host star, if these directions are misaligned. This induces internal fluid ...
The geometry and representation theory of superconformal quantum mechanics
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsJesus College, 2016-06-28)
We study aspects of the quantum mechanics of nonlinear $\sigma$-models with superconformal invariance. The connection between the differential geometry of the target manifold and symmetries of the quantum mechanics is ...
Second-Order Asymptotics of Visible Mixed Quantum Source Coding via Universal Codes
(IEEEIEEE Transactions on Information Theory, 2016-05-23)
The simplest example of a quantum information source with memory is a mixed source, which emits signals entirely from one of two memoryless quantum sources with given $\textit{a priori}$ probabilities. Considering a mixed ...
Unsteady flow and particle migration in dense, non-Brownian suspensions
(AIPJournal of Rheology, 2016)
We present experimental results on dense corn-starch suspensions as examples of non-Brownian, nearly-hard particles that undergo continuous and discontinuous shear thickening (CST and DST) at intermediate and high densities ...
An a$_{0}$ resonance in strongly coupled πη, K$\bar K$ scattering from lattice QCD
(American Physical SocietyPhysical Review D, 2016-05-11)
We present the first calculation of coupled-channel meson-meson scattering in the isospin =1, G-parity negative sector, with channels πη, K$\bar K$ and πη′, in a first-principles approach to QCD. From the discrete spectrum ...
Turning on gravity with the Higgs mechanism
(IOP PublishingClassical and Quantum Gravity, 2016-06-21)
We investigate how a Higgs mechanism could be responsible for the
emergence of gravity in extensions of Einstein theory, with a suitable low energy limit.
In this scenario, at high energies, symmetry restoration could "turn ...
Numerical solution of Sturm–Liouville problems via Fer streamers
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsHomerton College, 2016-06-28)
The subject matter of this dissertation is the design, analysis and practical implementation of a new numerical method to approximate the eigenvalues and eigenfunctions of regular Sturm–Liouville problems, given in Liouville’s ...
Multiwavelength study of 20 jets that emanate from the periphery of active regions
(EDP SciencesAstronomy & Astrophysics, 2016-04-15)
$\textit{Aims}$. We present a multiwavelength analysis of 20 EUV jets which occurred at the periphery of active regions close to sunspots. We discuss the physical parameters of the jets and their relation with other phenomena ...
Time-domain implementation of an impedance boundary condition with boundary layer correction
(ElsevierJournal of Computational Physics, 2016-06-08)
A time-domain boundary condition is derived that accounts for the acoustic impedance of a thin boundary layer over an impedance boundary, based on the asymptotic frequency-domain boundary condition of Brambley [2011, AIAA ...