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Generations: three prints, in colour
(SpringerJournal of High Energy Physics, 2014-10-07)
We point out a somewhat mysterious appearance of SUc(3) representations, which exhibit the behaviour of three full generations of standard model particles. These representations are found in the Clifford algebra ℂl(6), ...
Twisting algebraically special solutions in five dimensions
(Institute of PhysicsClassical and Quantum Gravity, 2016)
We determine the general form of the solutions of the five-dimensional vacuum Einstein equations with cosmological constant for which (i) the Weyl tensor is everywhere type II or more special in the null alignment ...
Charge quantization from a number operator
(ElsevierPhysics Letters B, 2015-01-26)
We explain how an unexpected algebraic structure, the division algebras, can be seen to underlie a generation of quarks and leptons. From this new vantage point, electrons and quarks are simply excitations from the neutrino, ...
Nonlinear tides in a homogeneous rotating planet or star: global modes and elliptical instability
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-03-28)
We revisit the global modes and instabilities of homogeneous rotating ellipsoidal fluid masses, which are the simplest global models of rotationally and tidally deformed gaseous planets or stars. The tidal flow in a ...
Nonlinear tides in a homogeneous rotating planet or star: global simulations of the elliptical instability
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016)
I present results from the first global hydrodynamical simulations of the elliptical instability in a tidally deformed gaseous planet (or star) with a free surface. The elliptical instability is potentially important for ...
Small acoustically forced symmetric bodies in viscous fluids
(American Institute of PhysicsJournal of the Acoustical Society of America, 2016-03-03)
The total force exerted on a small rigid body by an acoustic field in a viscous fluid is addressed analytically in the limit where the typical size of the particle is smaller than both the viscous diffusion length scale ...
A squirmer across Reynolds numbers
(Cambridge University PressJournal of Fluid Mechanics, 2016)
The self-propulsion of a spherical squirmer - a model swimming organism that achieves locomotion via steady tangential movement of its surface - is quantified across the transition from viscously to inertially dominated ...
Atomic Processes for Astrophysical Plasmas
(Institute of PhysicsJournal of Physics B: Atomic, Molecular and Optical Physics, 2016)
In this review we summarize the recent calculations and improvements of atomic data that we have carried out for the analysis of astrophysical spectroscopy within the Atomic Processes for Astrophysical Plasmas (APAP) ...
The Complexity of Divisibility
(ElsevierLinear Algebra and its Applications, 2016-04-08)
We address two sets of long-standing open questions in linear algebra and probability theory, from a computational complexity perspective: stochastic matrix divisibility, and divisibility and decomposability of probability ...
Spontaneous scalarization with massive fields
(American Physical SocietyPhysical Review D, 2016-03-03)
We study the effect of a mass term in the spontaneous scalarization of neutron stars, for a wide range of scalar field parameters and neutron star equations of state. Even though massless scalars have been the focus of ...