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• W3105467508 abstract "We consider a dynamical field theory (Active Model B+) that minimally extends the equilibrium Model B for diffusive phase separation of a scalar field, by adding leading-order terms that break time-reversal symmetry. It was recently shown that such active terms can cause the bulk phase separation of Model B to be replaced by a steady state of microphase separation at a finite length scale. This phenomenon was understood at mean-field level as due to the activity-induced reversal of the Ostwald ripening mechanism, which provides the kinetic pathway to bulk phase separation in passive fluids. This reversal occurs only in certain ranges for the activity parameters. In this paper we go beyond such a mean-field analysis and develop a $1$-loop Renormalisation Group (RG) approach. We first show that, in the parameter range where bulk phase separation is still present, the critical point belongs formally to the same (Wilson-Fisher) universality class as the passive Model B. In contrast, in a parameter range associated with microphase separation, we find that an unstable non-equilibrium fixed point of the RG flow arises for $dgeq 2$, colliding with the Wilson-Fisher point in $dto 2^+$ and making it unstable in $d=2$. At large activity, the flow in this region is towards strong coupling. We argue that the phase transition to microphase separation in active systems, in the physically relevant dimensions $d=2$ and $3$, very probably belongs to a new non-equilibrium universality class. Because it is governed by the strong-coupling regime of the RG flow, our perturbative analysis leaves open the quantitative characterization of this new class." @default.
• W3105467508 created "2020-11-23" @default.
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• W3105467508 creator A5081322351 @default.
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• W3105467508 date "2018-12-19" @default.
• W3105467508 modified "2023-10-04" @default.
• W3105467508 title "From bulk to microphase separation in scalar active matter: a perturbative renormalization group analysis" @default.
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• W3105467508 doi "https://doi.org/10.1088/1742-5468/aaf321" @default.
• W3105467508 hasPublicationYear "2018" @default.
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