Physical review. E最新文献_第2页

GPU-accelerated sequential Monte Carlo for Bayesian spectral analysis. gpu加速序列蒙特卡罗贝叶斯光谱分析。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/35xk-s7w3

Tomohiro Nabika, Yui Hayashi, Masato Okada

{"title":"GPU-accelerated sequential Monte Carlo for Bayesian spectral analysis.","authors":"Tomohiro Nabika, Yui Hayashi, Masato Okada","doi":"10.1103/35xk-s7w3","DOIUrl":"https://doi.org/10.1103/35xk-s7w3","url":null,"abstract":"Bayesian spectral deconvolution provides a data-driven framework for mathematical model selection and parameter estimation from spectral data. Although highly versatile, its computational cost grows with the number of model parameters, data points, and candidate models, often rendering practical applications infeasible. We propose a GPU-accelerated approach in which a sequential Monte Carlo sampler (SMCS) is executed in parallel on a GPU to perform Bayesian model selection for the number of spectral peaks and Bayesian estimation of peak-function parameters. Numerical experiments demonstrate that the GPU-parallelized SMCS reaches the free-energy accuracy of an optimized CPU-parallelized replica exchange Monte Carlo (REMC) baseline up to approximately 37× faster-with smaller gains, down to near parity, in the least favorable settings-and is faster than GPU-parallelized REMC in many of the tested cases. The method is validated on artificial data designed to emulate x-ray photoelectron spectroscopy and x-ray diffraction measurements, as well as on real experimental spectra. As measurement techniques such as microscopic spectroscopy and in situ methods continue to drive rapid growth in the volume of spectral data, the proposed approach offers a practical computational foundation for advanced analysis of each individual dataset.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"114 3-2","pages":"035303"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149207724","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

Liquid and solid layers in a thermal deep-learning machine. 热深度学习机器中的液体和固体层。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/twww-yj1y

Gang Huang, Lai Shun Chan, Hajime Yoshino, Ge Zhang, Yuliang Jin

引用次数: 0

Lattice Boltzmann methods with anisotropic equilibrium distributions. 各向异性平衡分布的晶格玻尔兹曼方法。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/zc7w-jk88

Benjamin Kellers, Julius Weinmiller, Arnulf Latz, Timo Danner

引用次数: 0

Intruder dynamics in granular media under localized surface loading. 局部表面载荷作用下颗粒介质中的入侵者动力学。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/xj4k-m7tw

E M Franklin, B Darbois Texier, A Seguin, D D Carvalho, Y Bertho

{"title":"Intruder dynamics in granular media under localized surface loading.","authors":"E M Franklin, B Darbois Texier, A Seguin, D D Carvalho, Y Bertho","doi":"10.1103/xj4k-m7tw","DOIUrl":"https://doi.org/10.1103/xj4k-m7tw","url":null,"abstract":"We experimentally investigate the dynamics of a spherical intruder driven horizontally at a constant force in a granular medium subjected to a localized surface overload. While intruder motion beneath a free surface exhibits constant acceleration in the quasistatic regime, the presence of a surface load induces a pronounced transient deceleration when the intruder passes below the loaded region. The magnitude of this deceleration increases with the applied overload and saturates at large overloads, while it decreases with intruder depth. Introducing a characteristic timescale and an overload-based Froude number, we show that the deceleration dynamics collapse onto master curves. We further develop a model incorporating stress transmission from the surface, which partially captures the intruder deceleration. In this approach, this deceleration is shown to depend on two parameters: the overload and the area on which this overload is applied. These results provide a framework to quantify how localized surface stresses influence subsurface intruder dynamics, with implications for locomotion, root growth, and underground transport in granular media.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"114 3-2","pages":"035408"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149207776","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

Statistical mechanics of the N-queens problem. n皇后问题的统计力学。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/cx7m-n3d5

Zong-Yue Liu, Hai-Jun Liao, Lei Wang

{"title":"Statistical mechanics of the N-queens problem.","authors":"Zong-Yue Liu, Hai-Jun Liao, Lei Wang","doi":"10.1103/cx7m-n3d5","DOIUrl":"https://doi.org/10.1103/cx7m-n3d5","url":null,"abstract":"The N-queens problem asks for the number Q(N) of ways to place N mutually nonattacking queens on an N×N chessboard. Simkin [M. Simkin, Adv. Math. 427, 109127 (2023)0001-870810.1016/j.aim.2023.109127] proved Q(N)∼(N/e^{γ})^{N}, and subsequent work [P. Nobel, A. Agrawal, and S. Boyd, Optim. Lett. 17, 1229 (2023)1862-447210.1007/s11590-022-01933-2] refined the constant to γ=1.94400(1), settling the asymptotic behavior of this classical combinatorial problem. In this work, we pursue a thermodynamic-integration route in an unrestricted lattice-gas ensemble. We map the N-queens problem to a lattice gas with pairwise repulsive interactions along shared rows, columns, and diagonals, and we perform extensive Monte Carlo simulations for N=8-1024 with 10^{8} sweeps per temperature point. The specific heat per queen C_{v}/N converges to a size-independent function with a broad, nondivergent maximum at T^{*}≈0.235J, associated with a defect-proliferation crossover. This convergence, combined with the trivially exact high-temperature entropy S(∞)/N=1/Nln(N^{2}/N), enables a thermodynamic integration of C_{v}/T that extracts the ground-state entropy and yields γ_{MC}=1.946±0.003 at N=1024, within 0.1% of the precise combinatorial value. The Simkin-Nobel value enters only as a benchmark; the thermodynamic route requires no prior knowledge of Q(N). We further present a transfer-matrix-based tensor-network formulation that encodes the nonattacking constraints into a rank-9 site tensor with 17 nonzero elements, providing a complementary exact-enumeration route.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"114 3-1","pages":"034125"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149207796","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

Sticky eigenstates in systems with sharply divided phase space. 具有明显相空间划分的系统中的粘性本征态。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/dwhh-42vk

Hua Yan

引用次数: 0

Stationary densities in a weakly nonconserving asymmetric exclusion process with finite resources. 有限资源弱非守恒不对称不相容过程中的平稳密度。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/sr5v-jwxp

Sourav Pal, Abhik Basu

引用次数: 0

Solvable model of noisy coupled oscillators with fully random interactions. 具有完全随机相互作用的噪声耦合振子的可解模型。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/72hc-zmsb

Harukuni Ikeda

引用次数: 0

Stabilizing generative adversarial networks with adaptive noise injection. 自适应噪声注入稳定生成对抗网络。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/ch8n-wrv6

Yamin Zhang, Fabing Duan, François Chapeau-Blondeau, Derek Abbott

{"title":"Stabilizing generative adversarial networks with adaptive noise injection.","authors":"Yamin Zhang, Fabing Duan, François Chapeau-Blondeau, Derek Abbott","doi":"10.1103/ch8n-wrv6","DOIUrl":"https://doi.org/10.1103/ch8n-wrv6","url":null,"abstract":"In conventional generative adversarial networks (GANs), the discriminator typically employs a sigmoid activation to map features to probabilities. However, this activation suffers from the vanishing-gradient problem, which can lead to training instability and mode collapse. This work reformulates the final-layer activation of the discriminator as cumulative distribution functions (CDFs) of random variables, thereby introducing a learnable noise-scale parameter. We show analytically that, for CDF families with bounded reversed hazard rates in the negative tail, a noise-scale value smaller than unity scales the gradient of both the saturating and nonsaturating generator losses by a factor proportional to its reciprocal. Rather than fully resolving the vanishing-gradient problem, this mechanism provides more informative gradient signals to the generator when the discriminator is close to its optimum. Experiments on a two-dimensional Gaussian mixture and on MNIST show that the proposed CDF-based activation effectively improves mode coverage and training stability. Meanwhile, experiments on CIFAR-10 using a deep convolutional GAN (DCGAN) indicate that, when gradient flow is already stabilized by architectural features, the choice of final-layer activation plays a more limited role. An ablation study on MNIST further distinguishes the benefits of the proposed method from that of conventional noise regularization techniques. These results demonstrate that the proposed CDF-based activation also contributes a meaningful scheme for stabilizing adversarial training.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"114 3-2","pages":"035304"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149207879","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

Optimizing injection protocols in Hele-Shaw displacements: A trade-off between swept area and injection time. 优化Hele-Shaw位移的注入方案：扫描面积和注入时间之间的权衡。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2026-09-01 DOI: 10.1103/bkyp-4c4w

Anna Luiza M B Mattos, Rafael M Oliveira, Pedro H A Anjos, Eduardo O Dias

{"title":"Optimizing injection protocols in Hele-Shaw displacements: A trade-off between swept area and injection time.","authors":"Anna Luiza M B Mattos, Rafael M Oliveira, Pedro H A Anjos, Eduardo O Dias","doi":"10.1103/bkyp-4c4w","DOIUrl":"https://doi.org/10.1103/bkyp-4c4w","url":null,"abstract":"Viscous fingering instabilities reduce the efficiency of immiscible displacement processes in radial Hele-Shaw flows. Time-dependent injection protocols provide a practical means of mitigating these instabilities, and previous studies have shown that linearly increasing injection rates can strongly suppress finger growth when both the total injected volume and the total injection time are fixed. Here we reformulate this optimization problem by prescribing a fixed radial distance and terminating the injection when the most advanced finger reaches it, a condition inspired by breakthrough in displacement processes. We then introduce a linear-plateau injection protocol, in which the injection rate increases linearly up to a switching time t_{m} and subsequently remains constant at a maximum value Q_{max}, reflecting the finite capacity of pumping systems. Using linear stability analysis and fully nonlinear boundary-integral simulations, we show that this linear-plateau protocol stabilizes the interface and increases the swept area, even though the interface evolves for a longer time than in a reference protocol with constant injection Q_{max} throughout the process. Finally, we introduce a profitlike function that balances the gain in swept area against the cost associated with longer injection times. This formulation is motivated by potential applications of the proposed control strategy to displacement processes in porous media, such as enhanced oil recovery and CO_{2} injection for geological storage. Optimization of this function identifies the switching time that provides the best trade-off between displacement efficiency and injection duration. These results establish a Hele-Shaw framework for optimizing injection protocols under a swept-area-injection-time trade-off while accounting for a maximum allowable injection rate.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"114 3-2","pages":"035105"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149207836","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