arXane › Physics › Nonlinear Sciences
Wednesday, 4 November 2026: 2 new papers, 1 cross-list and 6 replacements in Chaotic Dynamics (nlin.CD), in arXiv's order, with full abstracts. The same papers as arXiv's own listing, set as a newspaper; every title links to arXiv.
In this paper we establish a new theorem for nonintegrability of a perturbed, autonomous, two-degree-of-freedom Hamiltonian dynamical system with two independent resonances, based on a criterion which utilizes the well-known theorem of Poincar\'e and a Lie-series symplectic transformation. We also make certain assumptions and suggestions as to when the theorem holds and when it does not.
Linear and nonlinear mechanical structures with closely spaced modes and non-classical (nonproportional) damping distribution are susceptible to modal interactions with energy exchanges between modes. In this work we analyze these interactions in a two-degree-of-freedom (2 DoF) coupled oscillator subject to impulse excitation, utilizing action-angle variables and the method of multiple scales. To show the basic steps of the methodology we start from the linear system, then proceed to analyze modal interactions in the system with strongly nonlinear cubic stiffness nonlinearity. In contrast to the linear case, once the dynamics of the nonlinear system is captured in 1:1 resonance, strongly nonlinear modal interactions occur depending on energy. These regimes as well as attraction to capture, 1:1 capture and escape from capture are analyzed in detail. Our analytical study determines the ranges of parameter values for which nonlinear modal interactions due to resonance capture occur. The analytical predictions are fully verified by direct numerical simulations of the governing equations of motion. Possible extensions of the present work to systems of oscillators with more DoF and other types of dissipative elements, e.g., friction or hysteresis are discussed.
Turbulence is defined by a set of emergent and singular phenomena: a constant-flux energy cascade, intermittency, a dissipation rate that survives the vanishing of viscosity, and the spontaneous loss of determinism of the inviscid limit. Which physical ingredients produce them remains unclear, because in fluids they always come together with incompressibility, spatial structure and vortex dynamics. Here we show that a hierarchy of inertia, coupled by the purely geometric nonlinearity of rigid constraints, is enough. A planar chain of rigid pendula whose lengths and masses decrease geometrically, coupled only through nearest-neighbor constraints, develops a far-from-equilibrium cascade that replaces thermal equipartition, with statistically local and time-irreversible energy transfer despite intrinsically nonlocal coupling. Its fluctuations are intermittent, yet self-similarity is restored by a hidden scale symmetry. As the viscosity vanishes, the dissipation rate saturates at a finite value, and thermal noise consistent with fluctuation-dissipation balance is amplified from the smallest to the largest scales within a fraction of a large-scale period. Because the hierarchy can be tuned and the same dynamics can be realized mechanically or electrically, turbulence becomes a property that can be designed and measured in the laboratory.