68 citations · 153 across the 12 of their papers we have counts for
12 papers
Multi-tasking via baseline control in recurrent neural networks
Shun Ogawa, Francesco Fumarola, Luca Mazzucato
Changes in an animal's behavioral state, such as arousal and movements, induce {complex modulations of the baseline input currents to sensory areas, eliciting sensory modality-spec…
Edge of chaos and avalanches in neural networks with heavy-tailed synaptic weight distribution
Łukasz Kuśmierz, Shun Ogawa, Taro Toyoizumi
We propose an analytically tractable neural connectivity model with power-law distributed synaptic strengths. When threshold neurons with biologically plausible number of incoming…
Influence of toroidal flow on stationary density of collisionless plasmas
Elias Laribi, Shun Ogawa, Guilhem Dif-Pradalier +3
Starting from the given passive particle equilibrium particle cylindrical profiles, we built self-consistent stationary conditions of the Maxwell-Vlasov equation at thermodynamic e…
Tailoring steep density profile with unstable points
Shun Ogawa, Xavier Leoncini, Alexei Vasiliev +1
The mesoscopic properties of a plasma in a cylindrical magnetic field are investigated from the view point of test-particle dynamics. When the system has enough time and spatial sy…
Study on creation and destruction of transport barriers via effective safety factors for energetic particles
Shun Ogawa, Xavier Leoncini, Guilhem Dif-Pradalier +1
Charged particles with low kinetic energy move along magnetic field lines, but so do not energetic particles. We investigate the topological structure changes in the phase space of…
Full particle orbit effects in regular and stochastic magnetic fields
Shun Ogawa, Benjamin Cambon, Xavier Leoncini +4
We present a numerical study of charged particle motion in a time-independent magnetic field in cylindrical geometry. The magnetic field model consists of an unperturbed reversed-s…
Landau like theory for universality of critical exponents in quasistatioary states of isolated mean-field systems
Shun Ogawa, Yoshiyuki Y. Yamaguchi
An external force dynamically drives an isolated mean-field Hamiltonian system to a long-lasting quasistationary state, whose lifetime increases with population of the system. For…
Conditions for predicting quasistationary states by rearrangement formula
Yoshiyuki Y. Yamaguchi, Shun Ogawa
Predicting the long-lasting quasistationary state for a given initial state is one of central issues in Hamiltonian systems having long-range interaction. A recently proposed metho…
Nonlinear response for external field and perturbation in the Vlasov system
Shun Ogawa, Yoshiyuki Y. Yamaguchi
A nonlinear response theory is provided by use of the transient linearization method in the spatially one-dimensional Vlasov systems. The theory inclusively gives responses to exte…
Dynamical pattern formations in two dimensional fluid and Landau pole bifurcation
Shun Ogawa, Julien Barré, Hidetoshi Morita +1
A phenomenological theory is proposed to analyze the asymptotic dynamics of perturbed inviscid Kolmogorov shear flows in two dimensions. The phase diagram provided by the theory is…
Non-mean-field Critical Exponent in a Mean-field Model : Dynamics versus Statistical Mechanics
Shun Ogawa, Aurelio Patelli, Yoshiyuki Y. Yamaguchi
The mean-field theory tells that the classical critical exponent of susceptibility is the twice of that of magnetization. However, the linear response theory based on the Vlasov eq…
Spectral and formal stability criteria of spatially inhomogeneous stationary solutions to the Vlasov equation for the Hamiltonian mean-field model
Shun Ogawa
Stability of spatially inhomogeneous solutions to the Vlasov equation is investigated for the Hamiltonian mean-field model to provide the spectral stability criterion and the forma…