Rafail V. Abramov

  1. A simple closure approximation for slow dynamics of a multiscale system: nonlinear and multiplicative coupling.

    Authors: Rafail V. Abramov
    Subjects: Dynamical Systems
    Abstract

    Many applications in contemporary science involve multiscale dynamics with
    time and space scale separation of patterns of motion, with fewer slowly
    evolving variables and much larger set of faster evolving variables. A direct
    numerical simulation of the evolution of such dynamics is typically
    computationally expensive, due to both the large number of fast variables and
    necessity for a small discretization time step to resolve fast components of
    dynamics.

  2. Improved linear response for stochastically driven systems.

    Authors: Rafail V. Abramov
    Subjects: Dynamical Systems
    Abstract

    The recently developed short-time linear response algorithm, which predicts
    the average response of a nonlinear chaotic system with forcing and dissipation
    to small external perturbation, generally yields high precision of the response
    prediction, although suffers from numerical instability for long response times
    due to positive Lyapunov exponents.

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