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We study the role of transverse spatial degrees of freedom in the dynamics of signal-idler phase locked states in type-II optical parametric oscillators. Phase locking stems from signal-idler polarization coupling which arises if the cavity birefringence and/or dichroism is not matched to the...
We describe a numerical algorithm for computing spin glass ground states with a high level of reliability. The proposed method uses a population based search and applies optimization on multiple scales. Benchmarks are given leading to estimates of the performance on large lattices.
Using the density-functional formalism we derive an expression for the distortion free energy of systems with continuous broken symmetry and use it to derive an expression for the elastic constants of smectic phases in which the director is tilted with respect to the smectic layer normal. As in...
Motivated by path-integral numerical solutions of diffusion processes, PATHINT , we present a tree algorithm, PATHTREE , which permits extremely fast accurate computation of probability distributions of a large class of general nonlinear diffusion processes.
We report on a Brownian dynamics simulation study of quasi-two-dimensional dispersions of colloidal spheres interacting by long-range electrostatic and dipolar magnetic forces. The calculated dynamic correlation functions are shown to obey dynamic scaling in terms of a characteristic relaxation...
RNA viruses are known to replicate with extremely high mutation rates. These rates are actually close to the so-called error threshold. This threshold is in fact a critical point beyond which genetic information is lost through a second-order phase transition, which has been dubbed as the...
Possible inconsistencies between the recent hydrogen H α spectral line shift measurements and modifications of the theory of these shifts by Escarguel et al. Phys. Rev. E 62 , 2667 (2000), and earlier measurements in dense plasmas and corresponding calculations are discussed. Some of the claimed...
A mechanism connecting the local untwisting and opening of DNA double helix is proposed. The presented thermodynamical approach is based on two models: the Peyrard-Bishop model that describes the denaturation of DNA due to thermal fluctuations and the model developed by the author describing...
We demonstrate an application of spherical harmonic decomposition to the analysis of the human electroencephalogram (EEG). We implement two methods and discuss issues specific to the analysis of hemispherical, irregularly sampled data. Spatial sampling requirements and performance of the methods...
The propagation of a narrow-band signal radiated by a point source in a randomly layered absorbing medium is studied asymptotically in the weak-scattering limit. It is shown that in a disordered stratified medium that is homogeneous on average, a pulse is channelled along the layers in a narrow...
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