Search results for "classical"

Line of polarization attraction in highly birefringent optical fibers

2014

We investigate the phenomenon of polarization attraction in a highly birefringent fiber. This polarization process originates from the nonlinear interaction of two counter-propagating beams. We show that all polarization states of the forward (signal) beam are attracted toward a specific line of polarization states on the surface of the Poincare sphere, whose characteristics are determined by the polarization state of the injected backward (pump) beam. This phenomenon of polarization attraction takes place without any loss of energy for the signal beam. The stability of different stationary solutions is also discussed through intensive numerical simulations. On the basis of mathematical tec…

Creating highly squeezed vacua in hybrid Laguerre-Gauss modes

2009

In this communication we study the above threshold quantum properties of a degenerate optical parametric oscillator (DOPO) tuned to a given transverse mode family at the signal frequency. We will show that under this configuration DOPOs are versatile sources of nonclassical light, in which one could be able to generate highly squeezed vacua with the non trivial shapes of Hybrid Laguerre-Gauss modes.

Understanding the global structure of two-level quantum systems with relaxation: Vector fields organized through the magic plane and the steady-state…

2013

From kinks to compactonlike kinks

1998

We show that, in the continuum limit, the generalized \ensuremath{\Phi}-four or double-well model with nonlinear coupling can exhibit compactonlike kink solutions for some specific velocity regimes and when the nonlinear coupling between pendulums is dominant. Our numerical simulations point out that the static compacton is stable and the dynamic compacton is unstable. Our study is extended to other topological systems where compacton solutions can also be found. A nice feature is that a mechanical analog of the double-well system can be constructed in the form of an experimental lattice of coupled pendulums, which, in the strong coupling limit, allows the observation of these entities.

Test of molecular mode coupling theory for general rigid molecules

2000

We report recent progress on the test of mode coupling theory for molecular liquids (MMCT) for molecules of arbitrary shape. The MMCT equations in the long time limit are solved for supercooled water including all molecular degrees of freedom. In contrast to our earlier treatment of water as a linear molecule, we find that the glass-transition temperature ${T}_{c}$ is overestimated by the theory as was found in the case of simple liquids. The nonergodicity parameters are calculated from the ``full'' set of MMCT equations truncated at ${l}_{\mathrm{co}}=2.$ These results are compared (i) with the nonergodicity parameters from MMCT with ${l}_{\mathrm{co}}=2$ in the ``dipole'' approximation ${…

Towards an atomistic understanding of solid friction by computer simulations

2002

Friction between two solid bodies in sliding motion takes place on a large spectrum of length and time scales: From the nanometer/second scale in an atomic force microscope up to the extremely macroscopic scales of tectonic motion. Despite our familiarity with friction, fundamental questions about its atomistic origins remain unanswered. Phenomenological laws that describe the friction in many systems were published more than 300 years ago by Amontons: The frictional force is proportional to the applied load and independent of the apparent area of contact. The atomistic origins of this simple law is still controversial. Many explanations, which seemed to be well-established until recently, …

The Three-Body Problem

1972

The quantum mechanical three-body problem has been studied with increasing interest in the last decade. The main progress was achieved by deriving integral equations which are not only theoretically correct, but also practically applicable. Such equations allow us in particular to investigate, besides three-body bound states, the scattering of an elementary particle from a bound two-particle system.

Diffusive Motion in Simple Liquids

2014

The diffusive motion of single particles in a simple liquids is shown to be related to the incoherent part of the neutron-scattering cross-section. Miscallaneous topics concerning the diffusive motion are discussed.

Structure and dynamics of massive galaxies at z=0 in a fully cosmological simulation

2012

In this contribution we present the results of an Eulerian adaptive mesh refinement (AMR) hydrodynamical and N-body simulation in a ΛCDM cosmology. The simulation used was performed with the cosmological code MASCLET (Quilis et al. 2004). Galaxies have been identified in the simulation outputs by means of an adaptive friends of friends algorithm applied to the star particles. To give light to our virtual galaxies we have assigned a spectrum to each stellar particle using the MIUSCAT stellar population models (Vazdekis et al. 2012; Ricciardelli et al. 2012).

Coherence loss in phase-referenced VLBI observations (Corrigendum)

2011

fat = K ν √ Δt sin θ, (2) where K ∼ 0.012 h0.5 GHz−1. This new equation implies a different value of the constant k1 in Eq. (4). The original value reported for k1 was ∼63, while the correct value is ∼1.3 × 104. Although Eq. (3) (together with the constants K and k1) was incorrectly written in the text, we emphasize that all the figures in the paper were generated, indeed, using the correct equations and constants.