### Enviaments recents

• #### Arnold diffusion for a complete family of perturbations ﻿

(Springer, 2017-01-01)
Article
Accés obert
In this work we illustrate the Arnold diffusion in a concrete example — the a priori unstable Hamiltonian system of 2 + 1/2 degrees of freedom H(p, q, I, f, s) = p2/2+ cos q - 1 + I2/2 + h(q, f, s; e) — proving that for ...
• #### A unified approach to explain contrary effects of hysteresis and smoothing in nonsmooth systems ﻿

(2017-09-01)
Article
Accés restringit per política de l'editorial
Piecewise smooth dynamical systems make use of discontinuities to model switching between regions of smooth evolution. This introduces an ambiguity in prescribing dynamics at the discontinuity: should the dynamics be given ...
• #### Central configurations of the planar coorbial satellite problem ﻿

(2004-10)
Article
Accés obert
We study the planar central configurations of the 1 +n body problem where one mass is large and the other n masses are infinitesimal and equal. We find analytically all these central configurations when 2=n=4. Numerically, ...
• #### Phasic firing and coincidence detection by subthreshold negative feedback: divisive or subtractive or, better, both ﻿

(2017-02-02)
Article
Accés obert
Phasic neurons typically fire only for a fast-rising input, say at the onset of a step current, but not for steady or slow inputs, a property associated with type III excitability. Phasic neurons can show extraordinary ...
• #### On the length and area spectrum of analytic convex domains ﻿

(2016-01)
Article
Accés obert
Area-preserving twist maps have at least two different (p, q)-periodic orbits and every (p, q)-periodic orbit has its (p, q)-periodic action for suitable couples (p, q). We establish an exponentially small upper bound for ...
• #### On the asymptotic wavenumber of spiral waves in lambda - omega systems ﻿

(2016-01-01)
Article
Accés restringit per política de l'editorial
In this paper we consider spiral wave solutions of a general class of $\lambda -\omega$ systems with a small twist parameter q and we prove that the asymptotic wavenumber of the spirals is a ${{\mathcal{C}}^{\infty}}$ ...
• #### Arnold's mechanism of diffusion in the spatial circular restricted three-body problem: A semi-analytical argument ﻿

(2016-11-01)
Article
Accés restringit per política de l'editorial
We consider the spatial circular restricted three-body problem, on the motion of an infinitesimal body under the gravity of Sun and Earth. This can be described by a 3-degree of freedom Hamiltonian system. We fix an energy ...
• #### Warp evidence in precessing galactic bar models ﻿

(EDP Sciences, 2016-04-01)
Article
Accés obert
Most galaxies have a warped shape when they are seen edge-on. The reason for this curious form is not completely known so far, so in this work we apply dynamical system tools to contribute to its explanation. Starting from ...
• #### Quasi-periodically driven quantum systems ﻿

(Walter De Gruyter, 2016-10-10)
Article
Accés obert
Floquet theory provides rigorous foundations for the theory of periodically driven quantum systems. In the case of non-periodic driving, however, the situation is not so well understood. Here, we provide a critical review ...
• #### Full analysis of small hypercycles with shortcircuits in prebiotic evolution ﻿

(2017-01-05)
Article
Accés restringit per política de l'editorial
It is known that hypercycles are sensitive to the so-called parasites and short-circuits. While the impact of parasites has been widely investigated for well-mixed and spatial hypercycles, the effect of short-circuits in ...