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- W4387156618 abstract "Nonequilibrium phase transitions are notably difficult to analyze because their mechanisms depend on the system's dynamics in a complex way due to the lack of time-reversal symmetry. To complicate matters, the system's steady-state distribution is unknown in general. Here, the phase diagram of the active Model B is computed with a deep neural network implementation of the geometric minimum action method (gMAM). This approach unveils the unconventional reaction paths and nucleation mechanism by which the system switches between the homogeneous and inhomogeneous phases in the binodal region. Our main findings are: (i) the mean time to escape the phase-separated state is (exponentially) extensive in the system size $L$, but it increases non-monotonically with $L$; (ii) the mean time to escape the homogeneous state is always finite, in line with the recent work of Cates and Nardini~[Phys. Rev. Lett. 130, 098203]; (iii) at fixed $L$, the active term increases the stability of the homogeneous phase, eventually destroying the phase separation in the binodal for large but finite systems. Our results are particularly relevant for active matter systems in which the number of constituents hardly goes beyond $10^7$ and where finite-size effects matter." @default.
- W4387156618 created "2023-09-30" @default.
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- W4387156618 date "2023-09-26" @default.
- W4387156618 modified "2023-09-30" @default.
- W4387156618 title "Unveiling the Phase Diagram and Reaction Paths of the Active Model B with the Deep Minimum Action Method" @default.
- W4387156618 doi "https://doi.org/10.48550/arxiv.2309.15033" @default.
- W4387156618 hasPublicationYear "2023" @default.
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