6 research outputs found
Textures and Newtonian Gravity
Newtonian theory is used to study the gravitational effects of a texture, in
particular the formation of massive structures.Comment: 4 pages, 4 ps figures, REVTEX, accepted for publication in PR
Chaotic Motion Around Prolate Deformed Bodies
The motion of particles in the field of forces associated to an axially
symmetric attraction center modeled by a monopolar term plus a prolate
quadrupole deformation is studied using Poincare surface of sections and
Lyapunov characteristic numbers. We find chaotic motion for certain values of
the parameters, and that the instability of the orbits increases when the
quadrupole parameter increases. A general relativistic analogue is briefly
discussed.Comment: RevTEX, 7 eps figures, To appear in Phys Rev E (March 2001
Spatiotemporal chaos in the dynamics of buoyantly and diffusively unstable chemical fronts
Nonlinear dynamics resulting from the interplay between diffusive and buoyancy-driven Rayleigh-Taylor (RT) instabilities of autocatalytic traveling fronts are analyzed numerically for various values of the relevant parameters. These are the Rayleigh numbers of the reactant A and autocatalytic product B solutions as well as the ratio D=D B/D A between the diffusion coefficients of the two key chemical species. The interplay between the coarsening dynamics characteristic of the RT instability and the constant short wavelength modulation of the diffusive instability can lead in some regimes to complex dynamics dominated by irregular succession of birth and death of fingers. By using spectral entropy measurements, we characterize the transition between order and spatial disorder in this system. The analysis of the power spectrum and autocorrelation function, moreover, identifies similarities between the various spatial patterns. The contribution of the diffusive instability to the complex dynamics is discussed. © 2012 American Institute of Physics.SCOPUS: ar.jinfo:eu-repo/semantics/publishe