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- W2135630993 abstract "Recently models describing the dynamics of large arrays of Josephson junctions coupled through a variety of loads have been studied. Since, in applications, these systems are to be operated in a state of stable synchronous oscillation, these studies have emphasized how the synchronous periodic state can lose stability. A common feature of the models equations is that they are invariant under permutation of the individual junctions. In the authors' study they focus on the effects that these symmetries have on the resulting bifurcations when the synchronous solution loses stability. In these systems the causes for loss of stability are: fixed-point bifurcations and period-doubling bifurcations. Moreover, these two bifurcations can coalesce in a new codimension-two bifurcation which they call a homoclinic twist bifurcation. Due to the SN symmetry, it can be shown that the fixed-point bifurcations must lead to families of unstable periodic orbits. The period-doubling bifurcations, however, can lead to stable period-doubled oscillations, and the possible states and their stabilities are classified. In particular, generically, all of the period-doubled oscillations are described by dividing the junctions into two or three groups within which the junctions oscillate synchronously. The existence of these states in the model equations have been confirmed by numerical simulation. In addition to these period-doubled states, the existence of the homoclinic twist bifurcation and periodic solutions where the junctions oscillate with the same waveform but (1/N)th of a period out of phase with each other is observed in the numerical simulation. These last types of solution are called ponies on a merry-go-round (POMS). In these equations POMS do not arise from a local bifurcation. This issue is discussed in the companion paper." @default.
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- W2135630993 date "1991-08-01" @default.
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- W2135630993 title "Coupled arrays of Josephson junctions and bifurcation of maps with S<sub>N</sub>symmetry" @default.
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- W2135630993 doi "https://doi.org/10.1088/0951-7715/4/3/013" @default.
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