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Persistent dynamic correlations in self-organized critical systems away from their critical point

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URI: https://hdl.handle.net/10016/8906
ISSN: 0378-4371
DOI: 10.1016/j.physa.2006.05.001
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persistent_sanchez_pa_2007_ps.pdf (1.72 MB)
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2007-01
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Elsevier
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Abstract
We show that correlated dynamics and long time memory persist in self-organized criticality (SOC) systems even when forced away from the defined critical point that exists at vanishing drive strength. These temporal correlations are found for all levels of external forcing as long as the system is not overdriven. They arise from the same physical mechanism that produces the temporal correlations found at the vanishing drive limit, namely the memory of past events stored in the system profile. The existence of these correlations contradicts the notion that a SOC time series is simply a random superposition of events with sizes distributed as a power law, as has been suggested by previous studies.
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16 pages, 12 figures.-- PACS nrs.: 05.65.+b, 05.40.-a, 52.25.Fi, 96.60.Rd.-- ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/0503159
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Self-organized criticality, Running sandpile, Correlations, Hurst, Pulses
Bibliographic citation
Physica A: Statistical and Theoretical Physics, 2007, vol. 373, p. 215-230
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