Gulliver

France-Japan DNA encryption

Olivier Dauchot — 2026-04-02T13:20:17Z

Synchronized DNA sources for unconditionally secure cryptography
Congratulation to Sandra, Victoria, Vassily, Matthieu, Yannick and all the team for this world premiere. ArXiv paper Vidéo Présidence Vidéo du CNRS Le monde Libération La voix du Nord

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Spreading and absorption of silicone oil droplets on silicone elastomer films

Jeldy Cubas Hernandez — 2026-03-27T15:34:26Z

When a liquid droplet completely wets a hard substrate, its spreading dynamics follow Tanner's law, with the droplet radius growing as the one-tenth power of time. Here, we investigate how these dynamics change when silicone oil droplets spread on soft silicone elastomer and gel films supported by a rigid silicon substrate. While the droplets fully wet the elastomer surface, they also simultaneously swell the elastomer film. By varying the film thickness, we observe deviations from the (…)

- Recent papers / Accueil-publis

Francois Villemot joins Gulliver

Jeldy Cubas Hernandez — 2026-01-20T12:02:38Z

We are pleased to welcome Francois Villemot as our new CNRS research engineer in Gulliver. Francois obtained his PhD in Montpellier in 2014, followed by postdoctoral positions in the USA and Paris, and several years at a Paris-based start-up He joins us to support fundamental research, in particular regarding numerical methods and computational infrastructure.

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Tunable Poly(butylene oxide)-stat-polyglycidol Copolymers for Microfluidic-Assisted Nanoprecipitation Nanoparticle Design

Jeldy Cubas Hernandez — 2026-01-06T09:50:45Z

The self-assembly of amphiphilic copolymers into well-defined nanoparticles depends on the interplay among polymer composition, solvent exchange kinetics, and processing conditions. In this study, we explore the anionic ring-opening copolymerization of 1,2-epoxybutane and ethoxyethyl glycidyl ether (EEGE) followed by a deprotection step to synthesize poly(butylene oxide)-stat-polyglycidol (PBO-stat-PG) copolymers with tunable amphiphilicity. Reactivity ratio analysis confirmed the formation (…)

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Symmetry-driven artificial phononic media

Jeldy Cubas Hernandez — 2026-01-05T11:12:05Z

Phonons are quasiparticles associated with mechanical vibrations in materials. They are at the root of the propagation of sound and elastic waves, as well as of thermal phenomena, which are pervasive in our everyday life and in many technologies. The fundamental understanding and control of phonon responses in natural and artificial media are key in the context of communications, isolation, energy harvesting and control, sensing and imaging. It has recently been realized that controlling (…)

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Transition to Collective Motion in Nonreciprocal Active Matter: Coarse Graining Agent-Based Models into Fluctuating Hydrodynamics

Jeldy Cubas Hernandez — 2026-01-05T10:57:47Z

Two hallmarks of nonequilibrium systems, from active colloids to animal herds, are agent motility and nonreciprocal interactions. Their interplay creates feedback loops that lead to complex spatiotemporal dynamics crucial to understand and control the nonlinear response of active systems. Here, we introduce a minimal model that captures these two features at the microscopic scale while admitting an exact hydrodynamic theory valid also in the fully nonlinear regime. Using statistical (…)

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Stability conditions of chemical networks in a linear framework

Jeldy Cubas Hernandez — 2025-12-18T10:17:04Z

Autocatalytic chemical reaction networks can collectively replicate or maintain their constituents despite degradation reactions only above a certain threshold, which we refer to as the decay threshold. When the chemical network has a Jacobian matrix with the Metzler property, we leverage analytical methods developed for Markov processes to show that the decay threshold can be calculated by solving a linear problem, instead of the standard eigenvalue problem. We explore how this decay (…)

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Generalized exceptional points in nonlinear and stochastic dynamics

Jeldy Cubas Hernandez — 2025-12-09T12:22:37Z

We study a class of bifurcations generically occurring in dynamical systems with nonmutual couplings ranging from models of coupled neurons to predator-prey systems and nonlinear oscillators. In these bifurcations, extended attractors such as limit cycles, limit tori, and strange attractors merge and split in a similar way as fixed points in a pitchfork bifurcation. We show that this merging and splitting coincide with the coalescence of covariant Lyapunov vectors with vanishing Lyapunov (…)

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Nonreciprocally coupled spin glasses: Exceptional-point-mediated phase transitions and aging

Jeldy Cubas Hernandez — 2025-12-09T11:04:26Z

Disordered systems can exhibit a dramatic slowdown of their dynamics called aging. Contrary to the established understanding that this phenomenon is destroyed by nonreciprocal interactions, we here show that the outcome crucially depends on the structure of the system. Unlike previous studies, which focused on random nonsymmetric interactions between simple microscopic components, we investigate a scenario where nonreciprocally coupled agents are macroscopic entities with complex internal (…)

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Nonreciprocal Spin-Glass Transition and Aging

Jeldy Cubas Hernandez — 2025-11-24T10:26:56Z

Disordered systems generically exhibit aging and a glass transition. Previous studies have long suggested that non-reciprocity tends to destroy glassiness. Here, we show that this is not always the case using a bipartite spherical Sherrington-Kirpatrick model that describes the antagonistic coupling between two identical complex agents modelled as macroscopic spin glasses. Our dynamical mean field theory calculations reveal an exceptional-point mediated transition from a static disorder (…)

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