70 citations · 310 across the 10 of their papers we have counts for
10 papers
Breathers and Thermal Relaxation in Fermi-Pasta-Ulam Arrays
Ramon Reigada, Antonio Sarmiento, Katja Lindenberg
Breather stability and longevity in thermally relaxing nonlinear arrays depend sensitively on their interactions with other excitations. We review the relaxation of breathers in Fe…
Asymptotic Dynamics of Breathers in Fermi-Pasta-Ulam Chains
R. Reigada, A. Sarmiento, Katja Lindenberg
We study the asymptotic dynamics of breathers in finite Fermi-Pasta-Ulam chains at zero and non-zero temperatures. While such breathers are essentially stationary and very long-liv…
Energy Relaxation in Fermi-Pasta-Ulam Arrays
R. Reigada, A. Sarmiento, Katja Lindenberg
The dynamics of energy relaxation in thermalized one- and two-dimensional arrays with nonlinear interactions depend in detail on the interactions and, in some cases, on dimensional…
Energy Relaxation in Nonlinear One-Dimensional Lattices
R. Reigada, A. Sarmiento, Katja Lindenberg
We study energy relaxation in thermalized one-dimensional nonlinear arrays of the Fermi-Pasta-Ulam type. The ends of the thermalized systems are placed in contact with a zero-tempe…
Thermal Resonance in Signal Transmission
R. Reigada, A. Sarmiento, K. Lindenberg
We use temperature tuning to control signal propagation in simple one-dimensional arrays of masses connected by hard anharmonic springs and with no local potentials. In our numeric…
Harvesting Thermal Fluctuations: Activation Process Induced by a Nonlinear Chain in Thermal Equilibrium
R. Reigada, A. Sarmiento, A. H. Romero +2
We present a model in which the immediate environment of a bistable system is a molecular chain which in turn is connected to a thermal environment of the Langevin form. The molecu…
Enhanced Pulse Propagation in Non-Linear Arrays of Oscillators
A. Sarmiento, R. Reigada, A. H. Romero +1
The propagation of a pulse in a nonlinear array of oscillators is influenced by the nature of the array and by its coupling to a thermal environment. For example, in some arrays a…
One-Dimensional Arrays of Oscillators: Energy Localization in Thermal Equilibrium
R. Reigada, A. H. Romero, A. Sarmiento +1
All systems in thermal equilibrium exhibit a spatially variable energy landscape due to thermal fluctuations. Thus at any instant there is naturally a thermodynamically driven loca…
Surface temperature of a magnetized neutron star and interpretation of the ROSAT data. II
Dany Page, Antonio Sarmiento
We complete our study of pulsars' non-uniform surface temperature and of its effects on their soft X-ray thermal emission. Our previous work had shown that, due to gravitational le…
Chemical Evolution of Irregular and Blue Compact Galaxies
L. Carigi, P. Colin, M. Peimbert +1
We discuss the chemical evolution of metal poor galaxies and conclude that their oxygen deficiency is not due to: the production of black holes by massive stars or a varying slope…