I present results from numerical N-body simulations regarding the effect of merging events on the angular momentum distribution of galactic halos as well as a comparison of halo growth in semi-analytic vs. N-body methods. A total of six simulations are used spanning 3 cosmologies: a standard flat Ω0 = 1 model, an open Ω0 = 0.3 model and a “tilted” flat Ω0 = 1 model with spectral index n = 0.8. ...

The elementary excitations in superfluid liquid 4 He named rotons have an unusual dispersion curve. The energy is an approximately quadratic function of (p − p 0), the difference between the magnitude of the momentum p and a characteristic value p 0. As a result, while for p > p 0 a roton has its (group) velocity parallel to its momentum, when p < p 0 the velocity and momentum are antiparallel....

We calculate the momentum-dependent potentials for K + and K − mesons in a dispersion approach at nuclear density ρ 0 using the information from the vacuum K + N and K − N scattering amplitudes, however, leaving out the resonance contributions for the in-medium analysis. Whereas the K + potential is found to be repulsive (≈ + 30 MeV) and to show only a moderate momentum dependence, the K − self...

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The binding energy of Feshbach molecules from a two-component Fermi gas of 40K atoms has been experimentally measured with the momentum-resolved Raman spectroscopy. Comparing with the radiofrequency spectroscopy, in the present experiment the signal of unpaired (free atoms) and the bound molecules can be directly observed and the binding energy can be simultaneously determined in a single runni...

Using high-resolution angle-resolved photoemission spectroscopy we have studied the momentum and photon energy dependence of the anomalous high-energy dispersion, termed waterfalls, between the Fermi level and 1 eV binding energy in several high-T_{c} superconductors. We observe strong changes of the dispersion between different Brillouin zones and a strong dependence on the photon energy aroun...

The rich correlation physics in two-dimensional (2D) electron systems is governed by the dispersion of its excitations. In the fractional quantum Hall regime, excitations involve fractionally charged quasi particles, which exhibit dispersion minima at large momenta referred to as rotons. These rotons are difficult to access with conventional techniques because of the lack of penetration depth o...

We use the results of ultraprecise cold-atom-recoil experiments to constrain the form of the energy-momentum dispersion relation, a structure that is expected to be modified in several quantum-gravity approaches. Our strategy of analysis applies to the nonrelativistic (small speeds) limit of the dispersion relation, and is therefore complementary to an analogous ongoing effort of investigation ...

We obtain optical vortices with classical orbital momentum = 1 and spin j = ±1/2 as exact solutions of a system of nonlinear Maxwell equations (NMEs). Two kinds of Kerr-type media, namely, those with and without linear dispersion of the electric and the magnet susceptibility, are investigated. The electric and magnetic fields are represented as sums of circular and linear components. This allow...

We will summarize the progress in understanding the changes in the vector meson spectral density in nuclear medium using the constraint equations obtained from the Borel transformed dispersion relation and QCD Operator Product Expansion. We will discuss the results for the scalar mass shift and dispersion effects (three momentum dependence) for the light quark system (ρ, ω), the strange quark s...