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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2602.20716 |
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| _version_ | 1866914347086774272 |
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| author | Reyes, Francisco Vega Rodríguez-Rivas, Álvaro Maynar, Pablo de Soria, M. Isabel García |
| author_facet | Reyes, Francisco Vega Rodríguez-Rivas, Álvaro Maynar, Pablo de Soria, M. Isabel García |
| contents | We report the experimental observation of memory effects in a vertically vibrated thin granular layer. Following
a quench in the input acceleration, the granular temperature exhibits an anomalous Kovacs memory effect
confined to the initial fast relaxation stage. This memory vanishes shortly thereafter, yielding a
time-dependent memoryless regime governed solely by the instantaneous temperature before the system reaches
its final steady state. We develop a kinetic theory framework that quantitatively captures these features by
identifying the initial memory and subsequent memoryless regimes with the kinetic and hydrodynamic states,
respectively (that are well established in kinetic theory). Our analysis reveals that memory emerges during
fast transients through coupling between horizontal and vertical temperatures, a mechanism that fundamentally
constrains the accessible memory phenomenology and precludes observation of the standard Kovacs effect in
this system. Molecular dynamics simulations provide independent confirmation of all experimental and
theoretical findings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20716 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Kovacs memory effect in a thin granular layer: experimental evidence and its physical origin Reyes, Francisco Vega Rodríguez-Rivas, Álvaro Maynar, Pablo de Soria, M. Isabel García Soft Condensed Matter We report the experimental observation of memory effects in a vertically vibrated thin granular layer. Following a quench in the input acceleration, the granular temperature exhibits an anomalous Kovacs memory effect confined to the initial fast relaxation stage. This memory vanishes shortly thereafter, yielding a time-dependent memoryless regime governed solely by the instantaneous temperature before the system reaches its final steady state. We develop a kinetic theory framework that quantitatively captures these features by identifying the initial memory and subsequent memoryless regimes with the kinetic and hydrodynamic states, respectively (that are well established in kinetic theory). Our analysis reveals that memory emerges during fast transients through coupling between horizontal and vertical temperatures, a mechanism that fundamentally constrains the accessible memory phenomenology and precludes observation of the standard Kovacs effect in this system. Molecular dynamics simulations provide independent confirmation of all experimental and theoretical findings. |
| title | The Kovacs memory effect in a thin granular layer: experimental evidence and its physical origin |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2602.20716 |