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Consistency of the recent ATLAS Z+E_T^miss excess in a simplified general gauge mediation model
(APSPhysical Review D, 2015-05-20)
ATLAS recently reported a 3σ excess in a leptonic-Z+E_T^miss channel. This was interpreted in the literature in a simplified general gauge mediation model containing a gluino, a Higgsino next-to-lightest supersymmetric ...
Liquid Ropes: A Geometrical Model for Thin Viscous Jet Instabilities
(APSPhysical Review Letters, 2015-04-30)
Thin, viscous fluid threads falling onto a moving belt behave in a way reminiscent of a sewing machine, generating a rich variety of periodic stitchlike patterns including meanders, W patterns, alternating loops, and ...
Rapid mixing renders quantum dissipative systems stable
(APSPhysical Review A, 2015-04-09)
The physics of many materials is modeled by quantum many-body systems with local interactions.
If the model of the system is sensitive to noise from the environment, or small perturbations to the
original interactions, ...
The structure and stability of vortices in astrophysical discs
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2015-10-06)
This thesis finds that vortex instabilities are not necessarily a barrier to their potential as
sites for planetesimal formation.
It is challenging to build planetesimals from dust within the lifetime of a protoplanetary
disc ...
Discrete gravitational approaches to cosmology
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsTrinity College, 2015-06-30)
Exact solutions to the Einstein field equations are notoriously difficult to find. Most known solutions describe systems with unrealistically high degrees of symmetry. A notable example is the FLRW metric underlying ...
On the meaning of mixing efficiency for buoyancy driven mixing in stratified turbulent flows
(Cambridge University PressJournal of Fluid Mechanics, 2015-09-17)
The concept of a mixing efficiency is widely used to relate the amount of irreversible diabatic mixing in a stratified flow to the amount of energy available to support mixing. This common measure of mixing in a flow is ...
On the initial value problem in general relativity and wave propagation in black-hole spacetimes
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2014-11-11)
The first part of this thesis is concerned with the question of global uniqueness of solutions to the initial value problem in general relativity. In 1969, Choquet-Bruhat and Geroch proved, that in the class of globally ...
Inclined gravity currents filling basins: The influence of Reynolds number on entrainment into gravity currents
(AIPPhysics of Fluids, 2015-09-17)
Gravity currents of dense fluid feed basins in many important natural and industrial systems, such as lakes fed by dense rivers and auditoria supplied with cooled air by ventilation systems. The entrainment into these ...
Geometric capture and escape of a microswimmer colliding with an obstacle
(Royal Society of ChemistrySoft Matter, 2015-03-09)
Motivated by recent experiments, we consider the hydrodynamic capture of a microswimmer near a stationary spherical obstacle.
Simulations of model equations show that a swimmer approaching a small spherical colloid is ...
A multi-timescale analysis of phase transitions in precessing black-hole binaries
(APSPhysical Review D, 2015-09-14)
The dynamics of precessing binary black holes (BBHs) in the post-Newtonian regime has a strong timescale hierarchy: the orbital timescale is very short compared to the spin-precession timescale which, in turn, is much ...