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PreprintCC BY 4.0arXiv

Activity-Enhanced Ordering in Fluctuation-Induced First-Order Transitions

  • Suvendra K. Sahoo
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Abstract

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.

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Cite

BibTeXRIS
BibTeX
@misc{sahoo2026activityenhanced,
  title = {{Activity-Enhanced Ordering in Fluctuation-Induced First-Order Transitions}},
  author = {Suvendra K. Sahoo},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.30887},
  eprint = {2605.30887},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.30887},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Activity-Enhanced Ordering in Fluctuation-Induced First-Order Transitions
AU  - Suvendra K. Sahoo
PY  - 2026
DA  - 2026/09/10
PB  - arXiv
DO  - 10.48550/arxiv.2605.30887
UR  - https://arxiv.org/abs/2605.30887
AB  - 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.
ER  -