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57 papers · 1 filter
Generalized Lyapunov exponent as a unified characterization of dynamical instabilities
Takuma Akimoto, Masaki Nakagawa, Soya Shinkai +1
The Lyapunov exponent characterizes an exponential growth rate of the difference of nearby orbits. A positive Lyapunov exponent is a manifestation of chaos. Here, we propose the Ly…
Neutral bions in the CP^{N-1} model for resurgence
Tatsuhiro Misumi, Muneto Nitta, Norisuke Sakai
Classical configurations in the CP^{N-1} model on R^1 x S^1 is studied with twisted boundary conditions. Starting from fractional instantons with the Z_N twisted boundary condition…
Non-Abelian Sine-Gordon Solitons
Muneto Nitta
We point out that non-Abelian sine-Gordon solitons stably exist in the chiral Lagrangian. They also exist in a gauge theory with two by complex scalar fields…
Fractional instantons and bions in the O(N) model with twisted boundary conditions
Muneto Nitta
Recently, multiple fractional instanton configurations with zero instanton charge, called bions, have been revealed to play important roles in quantum field theories on compactifie…
D-brane solitons in various dimensions
Sven Bjarke Gudnason, Muneto Nitta
We construct a D-brane soliton, a composite topological soliton sharing some properties with a D-brane, in a Skyrme model in 4+1 dimensions, in which Skyrmions are strings ending o…
Recurrence of the Brownian motion in multidimensional semi-selfsimilar environments and Gaussian environments
Seiichiro Kusuoka, Hiroshi Takahashi, Yozo Tamura
Asymptotic behavior of the one-dimensional Brownian motion in general random environments has been investigated by many researchers. However, many of the methods used in the argume…