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Effective dynamics of a particle diffusing in time-dependent confinement.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014117
Pavol Kalinay
{"title":"Effective dynamics of a particle diffusing in time-dependent confinement.","authors":"Pavol Kalinay","doi":"10.1103/PhysRevE.111.014117","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.014117","url":null,"abstract":"<p><p>A pointlike particle diffusing in a two-dimensional channel is considered. Its width h(x,t) varies not only with the longitudinal coordinate x, but also in time t. Reducing the transverse degree of freedom in the corresponding diffusion equation, we arrive at the effective one-dimensional dynamics along the channel, represented by the generalized Fick-Jacobs equation; its coefficients calculated recursively also depend on time. In contrast to the static confinement, the moving boundaries generate an effective force driving the particle in the channel, which can be explicitly expressed within our method. We analyze this force in two examples: deformation of the boundary advancing as the traveling wave and in the channel \"breathing\" with an amplitude varying in x.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1-1","pages":"014117"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143459256","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}
引用次数: 0
Random search for a partially reactive target by multiple diffusive searchers.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014124
Byeong Guk Go, Juyeon Yi, Yong Woon Kim
{"title":"Random search for a partially reactive target by multiple diffusive searchers.","authors":"Byeong Guk Go, Juyeon Yi, Yong Woon Kim","doi":"10.1103/PhysRevE.111.014124","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.014124","url":null,"abstract":"<p><p>We study the first-passage problem for a partially reactive target by N identical diffusive particles in a finite d-dimensional space, laying a focus on the effects of the partial reactivity when searchers are initially excluded from the target region. By solving the Fokker-Planck equation, we obtain the mean first-passage time that exhibits a power-law dependence on the number of searchers as τ_{N}∼N^{-α}, proving that the exponent α varies with dimensionality, reactivity, and the number of searchers, and specifying conditions in which crossovers between different exponents occur. We confirm the validity of our analytic results by performing Langevin dynamics simulations for various sets of system parameters.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1-1","pages":"014124"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458532","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}
引用次数: 0
Discontinuous molecular dynamics simulations in an external field: Application to two-dimensional ferrofluids.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L013301
Matthew A Dorsey, Carol K Hall
{"title":"Discontinuous molecular dynamics simulations in an external field: Application to two-dimensional ferrofluids.","authors":"Matthew A Dorsey, Carol K Hall","doi":"10.1103/PhysRevE.111.L013301","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L013301","url":null,"abstract":"<p><p>We introduce a stochastic method for simulating the effect of an external magnetic field on coarse-grained models of magnetic colloids for use in discontinuous molecular dynamics (DMD) simulations. Our method for simulating an external field is illustrated with a coarse-grained model for magnetic squares in two dimensions. Square-shaped particles are represented as four disks bonded together in a 2×2 lattice configuration to create a hard colloidal geometry. Two opposite charges are embedded within the square to mimic the magnetic interactions between particles. The method for simulating an external field stochastically during DMD simulations operates by applying impulses randomly to the charges embedded within each square particle. When one square experiences an interaction with the field, each embedded charge within the square is assigned a new momentum with a specific magnitude and orientation. The magnitude of this momentum is equal to the average of a Maxwell-Boltzmann distribution at the simulation temperature. The orientation of the momentum depends on the charge, either positive or negative, and points either in the same or opposite direction as the field, respectively. The strength of the external field is determined by the average frequency at which the particles experience interactions with the field. The relationship between the stochastic frequency of the field and the field strength is derived from Newton's equation of motion. DMD simulations are performed for large systems of magnetic square particles at various temperatures and external field strengths. The simulation temperature is maintained constant with an Andersen thermostat, while the external field is simulated stochastically, as described above. We find that our simulation techniques reproduce a net system magnetization in close agreement with the two-dimensional equivalent of the Langevin function, while maintaining the simulation temperature constant.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L013301"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458797","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}
引用次数: 0
Deviations from random-matrix entanglement statistics for kicked quantum chaotic spin-1/2 chains.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L012104
Tabea Herrmann, Roland Brandau, Arnd Bäcker
{"title":"Deviations from random-matrix entanglement statistics for kicked quantum chaotic spin-1/2 chains.","authors":"Tabea Herrmann, Roland Brandau, Arnd Bäcker","doi":"10.1103/PhysRevE.111.L012104","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L012104","url":null,"abstract":"<p><p>It is commonly expected that for quantum chaotic many body systems, the statistical properties approach those of random matrices when increasing the system size. We demonstrate for various kicked spin-1/2 chain models that the average eigenstate entanglement indeed approaches the random matrix result. However, the distribution of the eigenstate entanglement differs significantly. While for autonomous systems such deviations are expected, they are surprising for the more scrambling kicked systems. Similar deviations occur in a tensor-product random matrix model with all-to-all interactions. Therefore, we attribute the origin of the deviations for the kicked spin-1/2 chain models to the tensor-product structure of the Hilbert spaces. As a consequence, this would mean that such many body systems cannot be described by the standard random matrix ensembles.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L012104"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458813","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}
引用次数: 0
Generative-machine-learning surrogate model of plasma turbulence.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L013202
B Clavier, D Zarzoso, D Del-Castillo-Negrete, E Frénod
{"title":"Generative-machine-learning surrogate model of plasma turbulence.","authors":"B Clavier, D Zarzoso, D Del-Castillo-Negrete, E Frénod","doi":"10.1103/PhysRevE.111.L013202","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L013202","url":null,"abstract":"<p><p>Generative artificial intelligence methods are employed for the first time to construct a surrogate model for plasma turbulence that enables long-time transport simulations. The proposed GAIT (Generative Artificial Intelligence Turbulence) model is based on the coupling of a convolutional variational autoencoder that encodes precomputed turbulence data into a reduced latent space, and a recurrent neural network and decoder that generate new turbulence states 400 times faster than the direct numerical integration. The model is applied to the Hasegawa-Wakatani (HW) plasma turbulence model, which is closely related to the quasigeostrophic model used in geophysical fluid dynamics. Very good agreement is found between the GAIT and the HW models in the spatiotemporal Fourier and Proper Orthogonal Decomposition spectra, and the flow topology characterized by the Okubo-Weiss decomposition. The GAIT model also reproduces Lagrangian transport including the probability distribution function of particle displacements and the effective turbulent diffusivity.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L013202"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458870","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}
引用次数: 0
Nonequilibrium interfacial diffusivity resolves anomalies in monolayer hydrodynamics.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L013501
Tyler J Mucci, Bruce L Liu, Joe A Adam, Amir H Hirsa, Jason Yalim, Juan M Lopez
{"title":"Nonequilibrium interfacial diffusivity resolves anomalies in monolayer hydrodynamics.","authors":"Tyler J Mucci, Bruce L Liu, Joe A Adam, Amir H Hirsa, Jason Yalim, Juan M Lopez","doi":"10.1103/PhysRevE.111.L013501","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L013501","url":null,"abstract":"<p><p>Hydrodynamics of surfactant monolayers are governed by surface tension, surface shear viscosity, surface dilatational viscosity, and surface diffusivity. While the first two have been studied comprehensively with consistent results, surface dilatational viscosity is plagued with anomalies, including apparent negative values. Here, full-field interfacial velocity measurements together with the Navier-Stokes equations reveal that a source of these anomalies is the use of equilibrium surface diffusivity for systems far from equilibrium. Specifically, surface diffisivity was found to be more than seven orders of magnitude (ten million times) larger in a nonsolenoidal interfacial flow field. Micron-sized phase domains in the monolayer are the likely culprit for the enhanced diffusivity.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L013501"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458895","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}
引用次数: 0
Stochastic Kuramoto oscillators with inertia and higher-order interactions.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L012202
Priyanka Rajwani, Sarika Jalan
{"title":"Stochastic Kuramoto oscillators with inertia and higher-order interactions.","authors":"Priyanka Rajwani, Sarika Jalan","doi":"10.1103/PhysRevE.111.L012202","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L012202","url":null,"abstract":"<p><p>The impact of noise in coupled oscillators with pairwise interactions has been extensively explored. Here, we study stochastic second-order coupled Kuramoto oscillators with higher-order interactions and show that as noise strength increases, the critical points associated with synchronization transitions shift toward higher coupling values. By employing the perturbation analysis, we obtain an expression for the forward critical point as a function of inertia and noise strength. Further, for overdamped systems, we show that as noise strength increases, the first-order transition switches to second-order even for higher-order couplings. We include a discussion on the nature of critical points obtained through Ott-Antonsen ansatz.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L012202"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458901","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}
引用次数: 0
Explosive transition in adaptive Stuart-Landau oscillators with higher-order interactions.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014302
Umesh Kumar Verma
{"title":"Explosive transition in adaptive Stuart-Landau oscillators with higher-order interactions.","authors":"Umesh Kumar Verma","doi":"10.1103/PhysRevE.111.014302","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.014302","url":null,"abstract":"<p><p>We investigate the nature of the transition to synchronization and death states in nonidentical Stuart-Landau oscillators adaptively coupled with pairwise and higher-order interactions. Our findings reveal that nonidentical Stuart-Landau oscillators globally coupled with higher-order interactions exhibit asynchronous oscillations. In contrast, systems coupled with pairwise interactions exhibit a continuous transition to synchronization. Introducing adaptation in pairwise interactions results in an explosive transition to synchronization. Furthermore, when the system is coupled with both pairwise and higher-order interactions, adaptation leads to an explosive transition to synchronization. For higher values of coupling strength, the coupled system also exhibits an explosive transition to the death state. Extending our analysis to random networks, we observe similar results. These findings align with the behavior observed in coupled Kuramoto oscillators, offering new insights into synchronization dynamics in complex systems with adaptive coupling and higher-order interactions.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1-1","pages":"014302"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458914","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}
引用次数: 0
Yang-Lee zeros for real-space condensation.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L012101
Zdzislaw Burda, Desmond A Johnston, Mario Kieburg
{"title":"Yang-Lee zeros for real-space condensation.","authors":"Zdzislaw Burda, Desmond A Johnston, Mario Kieburg","doi":"10.1103/PhysRevE.111.L012101","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L012101","url":null,"abstract":"<p><p>Using the electrostatic analogy, we derive an exact formula for the limiting Yang-Lee zero distribution in the random allocation model of general weights. This exhibits a real-space condensation phase transition, which is induced by a pressure change. The exact solution allows one to read off the scaling of the density of zeros at the critical point and the angle at which the locus of zeros hits the critical point. Since the order of the phase transition and critical exponents can be tuned with a single parameter for several families of weights, the model provides a useful testing ground for verifying various relations between the distribution of zeros and the critical behavior, as well as for exploring the behavior of physical quantities in the mesoscopic regime, i.e., systems of large but finite size. The main result is that asymptotically the Yang-Lee zeros are images of a conformal mapping, given by the generating function for the weights, of uniformly distributed complex phases.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L012101"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458922","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}
引用次数: 0
Anomalous diffusion in the square soft Lorentz gas.
IF 2.4 3区 物理与天体物理
Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014216
Esko Toivonen, Joni Kaipainen, Matti Molkkari, Joonas Keski-Rahkonen, Rainer Klages, Esa Räsänen
{"title":"Anomalous diffusion in the square soft Lorentz gas.","authors":"Esko Toivonen, Joni Kaipainen, Matti Molkkari, Joonas Keski-Rahkonen, Rainer Klages, Esa Räsänen","doi":"10.1103/PhysRevE.111.014216","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.014216","url":null,"abstract":"<p><p>We demonstrate and analyze anomalous diffusion properties of point-like particles in a two-dimensional system with circular scatterers arranged in a square lattice and governed by smooth potentials, referred to as the square soft Lorentz gas. Our numerical simulations reveal a rich interplay of normal and anomalous diffusion depending on the system parameters. To describe diffusion in normal regimes, we develop a unit cell hopping model that, in the single-hop limit, recovers the Machta-Zwanzig approximation and converges toward the numerical diffusion coefficient as the number of hops increases. Anomalous diffusion is characterized by quasiballistic orbits forming Kolmogorov-Arnold-Moser islands in phase space, alongside a complex tongue structure in parameter space defined by the interscatterer distance and potential softness. The distributions of the particle displacement vector show notable similarities to both analytical and numerical results for a hard-wall square Lorentz gas, exhibiting Gaussian behavior in normal diffusion and long tails due to quasiballistic orbits in anomalous regimes. Our work thus provides a catalog of key dynamical system properties that characterize the intricate changes in diffusion when transitioning from hard billiards to soft potentials.</p>","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1-1","pages":"014216"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458933","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}
引用次数: 0
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