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- W3048400101 abstract "The generalized Langevin equation (GLE) is a universal model for particle velocity in a viscoelastic medium. In this paper, we consider the GLE family with fractional memory kernels. We show that, in the critical regime where the memory kernel decays like $1/t$ for large $t$, the mean squared displacement (MSD) of particle motion grows linearly in time up to a slowly varying (logarithm) term. Moreover, we establish the well-posedness of the GLE in this regime. This solves an open question from [S. A. McKinley and H. D. Nguyen, SIAM J. Math. Anal., 50 (2018), pp. 5119--5160] and completes the answer to the conjecture put forward in [R. Morgado et al., Phys. Rev. Lett., 89 (2002), 100601] on the relationship between memory kernel decay and anomalously diffusive behavior. Under slightly stronger assumptions on the memory kernel, we construct an Abelian-Tauberian framework that leads to robust bounds on the deviation of the MSD around its asymptotic trend. This bridges the gap between the GLE memory kernel and the spectral density of anomalously diffusive particle motion characterized in [G. Didier and K. Zhang, J. Time Ser. Anal., 38 (2017), pp. 395--416]." @default.
- W3048400101 created "2020-08-18" @default.
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- W3048400101 date "2020-01-01" @default.
- W3048400101 modified "2023-09-25" @default.
- W3048400101 title "Asymptotic Analysis of the Mean Squared Displacement under Fractional Memory Kernels" @default.
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- W3048400101 doi "https://doi.org/10.1137/19m1238113" @default.
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