Physical Review E最新文献

{"title":"Conserved thermomechanic invariant in extended fluid description of collisionless plasmas.","authors":"E S Uchava, A G Tevzadze","doi":"10.1103/bhpx-y3ch","DOIUrl":"https://doi.org/10.1103/bhpx-y3ch","url":null,"abstract":"<p><p>We investigate linear perturbations of an incompressible, weakly collisional, anisotropic plasma in the low frequency limit using an extended 16-moment fluid description that retains parallel and perpendicular heat fluxes. We identify a class of linear perturbations associated with a conserved thermomechanic invariant, a time independent, aperiodic structure involving coupled perturbations of heat fluxes, velocity, and magnetic field. In the standard CGL limit, where heat fluxes are neglected, no direct analog of this invariant exists. Retaining heat flux dynamics alters the linear structure of the system promoting third order velocity moments to autonomous variables and gives rise to a thermomechanic mode with coupled thermal, kinetic, and magnetic components. The associated perturbations are inherently localized, favoring compact, filamentary aperiodic structures. The thermomechanic invariant reveals a stationary sector of collisionless anisotropic plasma dynamics, characterized by a fixed algebraic polarization that enforces time independent relations among the relevant perturbation fields.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-2","pages":"025206"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ziff-Gulari-Barshad model with reactive sulfur: Mean field approximation and Monte Carlo simulations.","authors":"Marcelo Freitas de Andrade, Mauricio Girardi","doi":"10.1103/5w99-ldht","DOIUrl":"https://doi.org/10.1103/5w99-ldht","url":null,"abstract":"<p><p>In this work, we propose and study an extension of the Ziff-Gulari-Barshad (ZGB) model for heterogeneous catalysis that incorporates sulfur (S) alongside the reactive gaseous species CO and O_{2}. By accounting for the formation and desorption of SO_{2} and COS, this model introduces reactions that alter the system's dynamic behavior. Through Monte Carlo simulations and site mean-field (SMF) approximations, we characterize the steady-state phase diagram which now presents new S-rich absorbing phases. We introduce an aggregation factor in the SMF approach to recover the continuous phase transition that is typically absent in standard mean-field treatments. Our results indicate that the second-order transition line between the active and the pure O absorbing phase remains belonging to the directed percolation universality class. Notably, we observe a promotion effect where small concentrations of sulfur enhance CO_{2} production by approximately 5% when compared to the pure ZGB model. This phenomenon is attributed to the efficient creation of vacant sites by sulfur-oxygen reactions, which optimizes the surface coverage and prevents CO poisoning.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-1","pages":"024136"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large-scale portfolio optimization with variational neural annealing.","authors":"Nishan Ranabhat, Behnam Javanparast, David Goerz, Estelle Inack","doi":"10.1103/p22k-x7p6","DOIUrl":"https://doi.org/10.1103/p22k-x7p6","url":null,"abstract":"<p><p>We employ a variational neural annealing approach for solving large-scale constrained portfolio optimization problems, mapped onto classical Ising-like Hamiltonians, and study its performance under finite annealing times. The method enables efficient exploration of high-dimensional feasible spaces and achieves competitive solutions on standard financial indices. To characterize the underlying optimization dynamics, we analyze the decay of the residual energy as a function of annealing steps and observe a power-law behavior for fixed problem size. Extending this analysis across different portfolio sizes, we examine whether the optimization dynamics are consistent with a dynamical finite-size scaling form and find that the residual energy data collapse onto a single scaling curve within the studied range. This scaling analysis yields an effective annealing-time exponent that quantifies how computational effort grows with problem size. Our results demonstrate that finite-size scaling concepts provide a useful framework for understanding and forecasting the performance of neural annealing-based optimization methods in realistic, constrained settings.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-1","pages":"024311"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth of helicity in salt-finger convection in the two-dimensional three-component limit.","authors":"Smiron Varghese, Benjamin Miquel, Wouter J T Bos","doi":"10.1103/rrcr-h8l9","DOIUrl":"https://doi.org/10.1103/rrcr-h8l9","url":null,"abstract":"<p><p>We present an analytical investigation of the global helicity budget associated with the salt-fingering instability within the two-dimensional, three-component framework. Our analysis shows that in the region of parameter space corresponding to salt fingering, helicity amplification occurs when the Rayleigh ratio-quantifying the relative strength of salinity to temperature gradients-exceeds a critical threshold. This finding provides a possible theoretical explanation for the spontaneous emergence of helicity, observed in recent numerical simulations.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2","pages":"L023101"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Junctional-fluctuation-mediated fluidization of multi-phase-field epithelial monolayers.","authors":"James N Graham, Jan Rozman","doi":"10.1103/lbph-g5kd","DOIUrl":"https://doi.org/10.1103/lbph-g5kd","url":null,"abstract":"<p><p>We analyze a multi-phase-field model for an epithelial monolayer with pairwise adhesions between neighboring cells following an Ornstein-Uhlenbeck process, representing the stochastic turnover of junctional molecular motors. These fluctuations in junctional adhesion result in rearrangements in the tissue, fluidizing it and producing diffusive cell motion. Similar junctional fluctuations have proven a very useful tool in the vertex model literature, and we hope they will be equally helpful to the multi-phase-field model approach. Moreover, we observe that the cells' effective diffusion coefficient depends nonmonotonically on the persistence time of the fluctuations, confirming results previously observed in the vertex model.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-1","pages":"024407"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Noise-shaped synchrony in neuronal oscillator networks.","authors":"Max Contreras, Philipp Hövel","doi":"10.1103/sxl4-6mdm","DOIUrl":"https://doi.org/10.1103/sxl4-6mdm","url":null,"abstract":"<p><p>Stochastic fluctuations often act as promoters of activity in excitable and oscillatory systems, giving rise to phenomena such as coherence resonance. Here, we show that in the low-intensity regime, noise plays a dual role in weakly coupled neuronal units: It can both inhibit collective spiking and, with increasing intensity, restore coordinated activity. For a ring of diffusively coupled, oscillatory FitzHugh-Nagumo neurons, we demonstrate how the interplay of noise and coupling strength organizes a rich set of collective dynamical states. We systematically classify emergent dynamical scenarios by an in-depth time-series analysis that integrates multiple complementary measures. We are able to automatically identify five distinct dynamical clusters in parameter space: pure noise, quiescent state, noisy synchronization, complete synchronization, and intermittent switching. Our workflow provides a general, automated framework for characterizing collective dynamics in coupled oscillator networks.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2","pages":"L022302"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Demonstration of ignition-driven radiation transport through a THOR hohlraum.","authors":"R S Lester, B M Haines, H M Johns, L Kot, B J Albright, M Durocher, Y Kim, J M Levesque, K D Meaney, S A Ricketts, H F Robey, R L Scott, T J Urbatsch, C H Wilde, S T Prisbrey, O L Landen, M E Martin, M D Rosen, E Dewald, N Aybar, S Baxamusa, M E Foord, R Funchess, S Hayes, R F Heeter, K Kasman, S Khan, A L Kritcher, J J Kroll, J L Milovich, W C Montgomery, K T Olson, S Paqueo, A Pedretti, N Roskopf, N Ruof, C V Young, L M Hobbs, S Vonhof, L Aghaian, A Allen, B Cates, K Clark, J Gaut, M Havre, V Ho, C Kong, T Phipps, M Ratledge, F Silva, W Vakki, J Wall, T Fehrenbach, C Wild","doi":"10.1103/k8dz-pjdx","DOIUrl":"https://doi.org/10.1103/k8dz-pjdx","url":null,"abstract":"<p><p>The achievement of fusion ignition at the National Ignition Facility opens new opportunities for foundational studies in opacity, radiation transport, and high-flux astrophysics in regimes previously unattainable. We have succeeded in the critical enabling step of demonstrating ignition in a hohlraum modified with diagnostic windows that burn through prior to ignition, granting experimental access to the brightest radiation source in the laboratory. This Letter reports the results of a deuterium-tritium-layered capsule implosion that achieved 2.4±0.09 MJ neutron yield in a hohlraum with windows designed to allow the escape of radiation energy from the capsule without significant loss of implosion symmetry, thus establishing a validated platform for next-generation radiation-driven experiments.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2","pages":"L023201"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Angular momentum of an unconfined charged Brownian particle in a static magnetic field within the framework of the generalized Langevin equation.","authors":"Vladimír Lisý, Jana Tóthová, Ján Buša","doi":"10.1103/297f-hxh9","DOIUrl":"https://doi.org/10.1103/297f-hxh9","url":null,"abstract":"<p><p>We investigate the angular momentum and kinetic energy of a classical charged Brownian particle in a static magnetic field within the framework of the generalized Langevin equation with Ornstein-Uhlenbeck noise. The mean kinetic energy retains its equilibrium value for all times after the external field is switched on. An analytical expression for the mean time-dependent angular momentum is derived and supported by high-precision numerical calculations. We show that, in the long-time limit, the mean angular momentum approaches a finite nonzero value. While this result might appear to contradict the Bohr-van Leeuwen theorem, we demonstrate that the system considered here does not correspond to a canonical equilibrium ensemble due to the absence of spatial confinement. In particular, although the velocity distribution thermalizes, the position of the particle remains unbounded, and the partition function over position space is not normalizable. The obtained nonzero angular momentum should therefore be interpreted as a property of a nonequilibrium asymptotic dynamical regime within the Langevin description rather than as a violation of equilibrium statistical mechanics. The present results provide a transparent analytical reference for stochastic dynamics of charged particles in magnetic fields and highlight the role of unbounded motion and noncommuting limits in such systems.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-1","pages":"024149"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-normal route to chaos.","authors":"D Sornette, V R Saiprasad, V Troude","doi":"10.1103/z9qv-51yj","DOIUrl":"https://doi.org/10.1103/z9qv-51yj","url":null,"abstract":"<p><p>Deterministic chaos is usually associated with local spectral expansion: Jacobian eigenvalues are expected to exceed unity somewhere on the attractor. We show that this view is incomplete in dimensions d>1. For non-normal Jacobians, pointwise spectral stability can suggest everywhere local contraction, while nonorthogonal eigenvectors still allow transient singular-vector amplification. We construct four low-dimensional deterministic maps realizing this mechanism: partition-reinjected, phase-prescribed, feedback-driven, and affine-reinjected non-normal routes to chaos. In all cases, the sampled one-step Jacobian remains spectrally stable at every point on the attractor away from switching boundaries, with the eigenvalues of the common planar core fixed inside the unit disk. Nevertheless, increasing non-normality raises the maximal Lyapunov exponent from negative to positive values, corresponding to sustained asymptotic chaos, not transient chaos. Across the four classes, the common signature is spectral radius ρ_{traj}^{max}<1, singular value σ_{traj}^{max}>1, maximal Lyapunov exponent λ_{1}>0, and an increase of attractor dimension. These examples identify non-normality and recurrent reinjection of transiently amplified directions as a deterministic route to chaos distinct from eigenvalue instability.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-1","pages":"024222"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wrapping of adjacent nanoparticles with varying sizes and distances by membrane tethers possessing bilayer asymmetry.","authors":"Jiaxiang Xue, Qingfen Yu","doi":"10.1103/jp7d-x6qd","DOIUrl":"https://doi.org/10.1103/jp7d-x6qd","url":null,"abstract":"<p><p>Membrane tethers are long, slender membrane tubes that transport biological cargo (proteins and viruses) and engineered materials (particles and drugs) in organelles, vesicles, and cells. Nanoparticles with enhanced bioavailability and reduced toxicity are attracting great attention in nanomedicine for their ability to target membrane tethers, particularly tunneling nanotubes, which share similar structures and functions with membrane tethers. Nevertheless, the molecular mechanisms that control the cooperative wrapping of nanoparticles within and on membrane tethers are not well understood. Our study aims to map the wrapping behavior and the associated membrane deformation for spherical nanoparticles entering and exiting membrane tethers (modeling both out-to-in and in-to-out wrapping). By integrating continuum membrane models and finite-element analysis, we systematically quantify how the equilibrium shapes, obtained via energy minimization, are governed by membrane spontaneous curvature, nanoparticle size, and interparticle distance. For out-to-in wrapping, the discontinuous binding-envelopment transitions between the nonwrapped and the complete-wrapped states are facilitated by long interparticle distances and small particle sizes, for which both the adhesion strengths and the energy barriers are low. For negative spontaneous curvature, however, the adhesion strengths are low while the energy barriers are high. The deformations of the contact lines that separate the membrane into the bound and unbound segments are larger for the shortest or the longest interparticle distances. For in-to-out wrapping, the stable partial-wrapped states are identified. In particular, the short interparticle distances lead to the discontinuous transitions between the shallow-wrapped and the deep-wrapped states. Negative spontaneous curvature, short interparticle distances, and large particle sizes favor the stable partial-wrapped states. Instead of aggregating into compact linear chains along the membrane tethers, the nanoparticles remain separated at well-defined lowest-energy positions. The deformations of the contact lines are slightly larger than those for out-to-in wrapping. The competition between the local curvature and the spontaneous curvature of the membrane gives rise to rich wrapping diagrams, and our numerically determined adhesion strengths are in agreement with the theoretical predictions. Our findings provide important insights into tether-nanoparticle interactions and offer guidelines for the design of functional nanomedicines.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"114 2-2","pages":"025409"},"PeriodicalIF":2.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149018438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}