Activity-Enhanced Ordering in Fluctuation-Induced First-Order Transitions
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866913172228669440 |
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| author | Sahoo, Suvendra K. |
| author_facet | Sahoo, Suvendra K. |
| contents | Fluctuations can drive otherwise continuous phase transitions to first order through the Brazovskii mechanism. We study how these fluctuation-induced transitions are modified in active systems by introducing nonequilibrium spatiotemporally correlated noise. We show that, while the transition remains fluctuation-induced first order, activity systematically suppresses these fluctuation effects, shifting the transition to higher temperatures and rendering it increasingly weakly first order. As a result, ordering is enhanced without inducing a spinodal instability of the isotropic phase, as confirmed by direct numerical simulations. In the strong-activity limit, fluctuation effects disappear and mean-field behavior is recovered. Our results identify activity as a generic control parameter for tuning the strength of fluctuation-induced first-order transitions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_30887 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Activity-Enhanced Ordering in Fluctuation-Induced First-Order Transitions Sahoo, Suvendra K. Statistical Mechanics Soft Condensed Matter Fluctuations can drive otherwise continuous phase transitions to first order through the Brazovskii mechanism. We study how these fluctuation-induced transitions are modified in active systems by introducing nonequilibrium spatiotemporally correlated noise. We show that, while the transition remains fluctuation-induced first order, activity systematically suppresses these fluctuation effects, shifting the transition to higher temperatures and rendering it increasingly weakly first order. As a result, ordering is enhanced without inducing a spinodal instability of the isotropic phase, as confirmed by direct numerical simulations. In the strong-activity limit, fluctuation effects disappear and mean-field behavior is recovered. Our results identify activity as a generic control parameter for tuning the strength of fluctuation-induced first-order transitions. |
| title | Activity-Enhanced Ordering in Fluctuation-Induced First-Order Transitions |
| topic | Statistical Mechanics Soft Condensed Matter |
| url | https://arxiv.org/abs/2605.30887 |