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Microscopic Origin of the Logarithmic Time Evolution of Aging Processes in Complex Systems
Umeå University, Faculty of Science and Technology, Department of Physics. NYU, Dept Phys, New York, NY 10003 USA and NYU, Ctr Soft Matter Res, New York, NY 10003 USA.
2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 20, 208301- p.Article in journal (Refereed) Published
Abstract [en]

There exists compelling experimental evidence in numerous systems for logarithmically slow time evolution, yet its full theoretical understanding remains elusive. We here introduce and study a generic transition process in complex systems, based on nonrenewal, aging waiting times. Each state n of the system follows a local clock initiated at t = 0. The random time tau between clock ticks follows the waiting time density psi (tau). Transitions between states occur only at local clock ticks and are hence triggered by the local forward waiting time, rather than by psi (tau). For power-law forms psi (tau) similar or equal to tau(-1-alpha) (0 < alpha < 1) we obtain a logarithmic time evolution of the state number < n(t)> similar or equal to log(t/t(0)), while for alpha > 2 the process becomes normal in the sense that < n(t)> similar or equal to t. In the intermediate range 1 < alpha < 2 we find the power-law growth < n(t)> similar or equal to t(alpha-1). Our model provides a universal description for transition dynamics between aging and nonaging states.

Place, publisher, year, edition, pages
American Physical Society , 2013. Vol. 110, no 20, 208301- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-73574DOI: 10.1103/PhysRevLett.110.208301ISI: 000319064100017OAI: oai:DiVA.org:umu-73574DiVA: diva2:632808
Available from: 2013-06-25 Created: 2013-06-25 Last updated: 2017-12-06Bibliographically approved

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Lizana, Ludvig

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