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Interface dynamics of wet active systems
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We study the roughening of interfaces in phase-separated active suspensions on substrates. At both large length and timescales, we show that the interfacial dynamics belongs to the |q|KPZ universality class discussed in Besse et al. Phys. Rev. Lett. 130, 187102 (2023). This holds despite the presence of long-ranged fluid flows. At early times, however, or for sufficiently small systems, the roughening exponents are the same as those in the presence of a momentum-conserving fluid. Surprisingly, when the effect of substrate friction can be ignored, the interface becomes random beyond a de Gennes-Taupin lengthscale which depends on the interfacial tension.
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Non-equilibrium coexistence between a fluid and a hotter or colder crystal of granular hard disks
A monodisperse granular hard-disk system can show coexistence of a hotter solid and a colder liquid when energy is supplied by a thermal bath, an effect explained by the lower collision frequency of the solid.
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