The effect of human motion on wake flow dynamics and particle dispersion were investigated by experimental visualisation and Computational Fluid Dynamics (CFD) modelling using a mannequin model with realistic human shape. A new smoke visualisation technique is proposed which made use of the chemical reaction between acetic acid and cyclohexylamine. The CFD model used a dynamic mesh to simulate ...

Bounds on the slope and the curvature of the scalar Kπ form factor at zero momentum transfer Abstract We derive and calculate unitarity bounds on the slope and curvature of the strangeness-changing scalar form factor at zero momentum transfer, using low-energy constraints and Watson final state interaction theorem. The results indicate that the curvature is important and should not be neglected...

Quasi-phase-matching is an important technique in nonlinear optics and is in widespread use. It not only makes efficient frequency conversion possible, but also enables diverse applications such as beam and pulse shaping, multi-harmonic generation, high harmonic generation, all-optical processing and the generation of entangled photons. However, since its introduction in the early 1960s at the ...

The breakdown of Lorentz’s and CPT invariance, as described by the Extension of the Standard Model, gives rise to a modification of the dispersion relation of particles. Consequences of such a modification are reviewed in the framework of pulsar kicks induced by neutrino oscillations (activesterile conversion). A peculiar feature of the modified energy-momentum relations is the occurrence of te...

I report, emphasizing some key open issues and some aspects that are particularly relevant for phenomenology, on the status of the development of “doubly-special” relativistic (“DSR”) theories with both an observer-independent high-velocity scale and an observer-independent small-length/large-momentum scale, possibly relevant for the Planck-scale/quantum-gravity realm. I also give a true/false ...

Weyl fermions are massless chiral particles first predicted in 1929 and once thought to describe neutrinos. Although never observed as elementary particles, quasiparticles with Weyl dispersion have recently been experimentally discovered in solid-state systems causing a furore in the research community. Systems with Weyl excitations can display a plethora of fascinating phenomena and offer grea...

Single-armed, stationary density waves can exist even in disks with only weak selfgravity, provided that the rotation curve is dominated by a central mass. Such waves could play a significant role in the transport of angular momentum. By variational methods, we derive nonlinear versions of the dispersion relation, angular momentum flux, and propagation velocity in the tight-winding limit. The p...

We show that a typical star is unlikely to migrate from its galacto-centric radius of birth by more than about 5% over its lifetime. Radial migration, or a secular change in a star’s angular momentum, is caused by stochastic scattering by spiral waves and by dense gas complexes. The expected change in angular momentum is related to the radial action acquired by the star from these processes and...

Quantum transport theory is used to calculate the nucleon spectral function in infinite nuclear matter. A self-consistent description is obtained by utilizing the relations between collision rates and correlation functions. Static and dynamical self-energies are taken into account in the single particle propagators. The real parts of the non-static selfenergy contributions are calculated by dis...

In this paper we study the angular momentum properties of simulated dark matter halos at high redshift that likely host the first stars in the Universe. Calculating the spin distributions of these 10 − 10 M⊙ halos in redshift slices from z = 15 − 6, we find that they are well fit by a log-normal distribution as is found for lower redshift and more massive halos in earlier work. We find that bot...