Spatiotemporal Hierarchy of Slow Avalanches During Creep
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908981421670400 |
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| author | Rudyak, Vladimir Yu. Shohat, Dor Lahini, Yoav |
| author_facet | Rudyak, Vladimir Yu. Shohat, Dor Lahini, Yoav |
| contents | Far from equilibrium, amorphous solids exhibit structural relaxations that span a vast range of timescales such as physical aging and creep. Recently, it has been shown that such relaxations are driven by via intermittent, scale-free, yet anomalously slow cascades of local rearrangements, termed 'thermal avalanches.' Here, we investigate the spatio-temporal dynamics of these avalanches during logarithmic creep, using simulations of a model amorphous solid. By systematically disentangling mechanical and thermal activation events, we reveal that thermal avalanches have a hierarchical spatio-temporal structure: localized rearrangement events group into fast and compact cascades, which then promote the thermal activation of subsequent cascades via long-range, noise-mediated facilitation. This process results in heavy-tailed temporal correlations reminiscent of seismic activity. We validate these findings using experiments on slow relaxation of crumpled matter. Our work provides a framework for identifying noise-mediated correlations and elucidates the rich structural dynamics underlying slow relaxation of amorphous solids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02573 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spatiotemporal Hierarchy of Slow Avalanches During Creep Rudyak, Vladimir Yu. Shohat, Dor Lahini, Yoav Soft Condensed Matter Disordered Systems and Neural Networks Far from equilibrium, amorphous solids exhibit structural relaxations that span a vast range of timescales such as physical aging and creep. Recently, it has been shown that such relaxations are driven by via intermittent, scale-free, yet anomalously slow cascades of local rearrangements, termed 'thermal avalanches.' Here, we investigate the spatio-temporal dynamics of these avalanches during logarithmic creep, using simulations of a model amorphous solid. By systematically disentangling mechanical and thermal activation events, we reveal that thermal avalanches have a hierarchical spatio-temporal structure: localized rearrangement events group into fast and compact cascades, which then promote the thermal activation of subsequent cascades via long-range, noise-mediated facilitation. This process results in heavy-tailed temporal correlations reminiscent of seismic activity. We validate these findings using experiments on slow relaxation of crumpled matter. Our work provides a framework for identifying noise-mediated correlations and elucidates the rich structural dynamics underlying slow relaxation of amorphous solids. |
| title | Spatiotemporal Hierarchy of Slow Avalanches During Creep |
| topic | Soft Condensed Matter Disordered Systems and Neural Networks |
| url | https://arxiv.org/abs/2507.02573 |