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MSD of a walker starting at the origin inside a circular territory with fluctuating boundaries. (a) The MSD as it varies with time for three different values of ξ = vT/R. As ξ increases, we move from a regime where the MSD is monotonic to one where oscillations occur. (b) The threshold ξ values for passing from one regime into another, for different choices of the dimensionless parameters K′ = KT/ρ2 and γ′ = γT. The various plots have been constructed using equation (3.4).
