Journal of Statistical Mechanics: Theory and Experiment最新文献_第4页

CTMRG study of the critical behavior of an interacting-dimer model 交互二聚体模型临界行为的 CTMRG 研究

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-08-01 DOI: 10.1088/1742-5468/ad5c5d

C Chatelain

引用次数: 0

Minimal model for chirally induced spin selectivity: spin-orbit coupling, tunneling and decoherence 手性诱导自旋选择性的最小模型：自旋轨道耦合、隧道和退相干

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-08-01 DOI: 10.1088/1742-5468/ad613b

Miguel Mena, Solmar Varela, Bertrand Berche and Ernesto Medina

{"title":"Minimal model for chirally induced spin selectivity: spin-orbit coupling, tunneling and decoherence","authors":"Miguel Mena, Solmar Varela, Bertrand Berche and Ernesto Medina","doi":"10.1088/1742-5468/ad613b","DOIUrl":"https://doi.org/10.1088/1742-5468/ad613b","url":null,"abstract":"Here we review a universal model for chirally induced spin-selectivity (CISS) as a standalone effect occurring in chiral molecules. We tie together the results of forward scattering in the gas phase to the results for photoelectrons in chiral self-assembled monolayers, and the more contemporary results in two terminal transport setups. We discuss the ingredients that are necessarily present in all experiments to date, which we identify as: (i) chirality, be it point, helical or configurational, (ii) the spin–orbit coupling as the spin active coupling of atomic origin, (iii) decoherence as a time-reversal symmetry breaking mechanism that avoids reciprocity relations in the linear regime and finally (iv) tunneling that accounts for the magnitude of the spin polarization effect. This proposal does not discard other mechanisms that can yield comparable spin effects related to interactions of the molecule to contacts or substrates that have been proposed but are less universal or apply to specific situations. Finally, we discuss recent results suggesting CISS as a molecular phenomenon in the realms of enantiomer selectivity, coherent electron transfer, and spin effects in chiroptical activity.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"19 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881080","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

A functional renormalization group for signal detection and stochastic ergodicity breaking 用于信号检测和随机遍历性破缺的功能重正化群

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-08-01 DOI: 10.1088/1742-5468/ad5c5c

Harold Erbin, Riccardo Finotello, Bio Wahabou Kpera, Vincent Lahoche and Dine Ousmane Samary

{"title":"A functional renormalization group for signal detection and stochastic ergodicity breaking","authors":"Harold Erbin, Riccardo Finotello, Bio Wahabou Kpera, Vincent Lahoche and Dine Ousmane Samary","doi":"10.1088/1742-5468/ad5c5c","DOIUrl":"https://doi.org/10.1088/1742-5468/ad5c5c","url":null,"abstract":"Signal detection is one of the main challenges in data science. As often happens in data analysis, the signal in the data may be corrupted by noise. There is a wide range of techniques that aim to extract the relevant degrees of freedom from data. However, some problems remain difficult. This is notably the case for signal detection in almost continuous spectra when the signal-to-noise ratio is small enough. This paper follows a recent bibliographic line, which tackles this issue with field-theoretical methods. Previous analysis focused on equilibrium Boltzmann distributions for an effective field representing the degrees of freedom of data. It was possible to establish a relation between signal detection and -symmetry breaking. In this paper, we consider a stochastic field framework inspired by the so-called ‘model A’, and show that the ability to reach, or not reach, an equilibrium state is correlated with the shape of the dataset. In particular, by studying the renormalization group of the model, we show that the weak ergodicity prescription is always broken for signals that are small enough, when the data distribution is close to the Marchenko–Pastur law. This, in particular, enables the definition of a detection threshold in the regime where the signal-to-noise ratio is small enough.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"56 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881081","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

Exact partition function of the Potts model on the Sierpinski gasket and the Hanoi lattice 西尔平斯基垫圈和河内晶格上波茨模型的精确分割函数

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-08-01 DOI: 10.1088/1742-5468/ad64bc

P D Alvarez

引用次数: 0

Thermal rectification in segmented Frenkel–Kontorova lattices with asymmetric next-nearest-neighbor interactions 具有不对称近邻相互作用的分段 Frenkel-Kontorova 晶格中的热整流

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-08-01 DOI: 10.1088/1742-5468/ad5c5a

M Romero-Bastida and A Poceros Varela

引用次数: 0

Laplacian renormalization group: an introduction to heterogeneous coarse-graining 拉普拉斯重正化群：异质粗粒化入门

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-08-01 DOI: 10.1088/1742-5468/ad57b1

Guido Caldarelli, Andrea Gabrielli, Tommaso Gili and Pablo Villegas

{"title":"Laplacian renormalization group: an introduction to heterogeneous coarse-graining","authors":"Guido Caldarelli, Andrea Gabrielli, Tommaso Gili and Pablo Villegas","doi":"10.1088/1742-5468/ad57b1","DOIUrl":"https://doi.org/10.1088/1742-5468/ad57b1","url":null,"abstract":"The renormalization group (RG) constitutes a fundamental framework in modern theoretical physics. It allows the study of many systems showing states with large-scale correlations and their classification into a relatively small set of universality classes. The RG is the most powerful tool for investigating organizational scales within dynamic systems. However, the application of RG techniques to complex networks has presented significant challenges, primarily due to the intricate interplay of correlations on multiple scales. Existing approaches have relied on hypotheses involving hidden geometries and based on embedding complex networks into hidden metric spaces. Here, we present a practical overview of the recently introduced Laplacian RG (LRG) for heterogeneous networks. First, we present a brief overview that justifies the use of the Laplacian as a natural extension of well-known field theories to analyze spatial disorder. We then draw an analogy to traditional real-space RG procedures, explaining how the LRG generalizes the concept of ‘Kadanoff supernodes’ as block nodes that span multiple scales. These supernodes help mitigate the effects of cross-scale correlations due to small-world properties. Additionally, we rigorously define the LRG procedure in momentum space in the spirit of the Wilson RG. Finally, we show different analyses for the evolution of network properties along the LRG flow following structural changes when the network is properly reduced.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"16 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881077","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

Critical speeding-up in dynamical percolation 动态渗流中的临界加速

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-07-30 DOI: 10.1088/1742-5468/ad6137

Eren Metin Elçi, Timothy M Garoni

引用次数: 0

An experimental study on the impact of motivation and gender on pedestrian movement characteristics in a bottleneck flow 关于动机和性别对瓶颈人流中行人移动特征影响的实验研究

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-07-29 DOI: 10.1088/1742-5468/ad6136

Hongliu Li, Xudong Li, Weiguo Song, Jun Zhang, Jacqueline TY Lo

{"title":"An experimental study on the impact of motivation and gender on pedestrian movement characteristics in a bottleneck flow","authors":"Hongliu Li, Xudong Li, Weiguo Song, Jun Zhang, Jacqueline TY Lo","doi":"10.1088/1742-5468/ad6136","DOIUrl":"https://doi.org/10.1088/1742-5468/ad6136","url":null,"abstract":"The influence of different motivations on pedestrian evacuation efficiency, like whether incentivizing faster moving or encouraging polite behaviors is beneficial to evacuation, and the potential existence of gender-based differences, still lacks clear answers. This study aims to narrow this gap by conducting a laboratory bottleneck evacuation experiment to investigate the influence of movement motivation and gender of pedestrians on evacuation efficiency. Our findings reveal that both bottleneck width and pedestrian motivation significantly impact the flow. For men, when the bottleneck width surpasses a threshold, high motivation increases the flow; below this threshold, it reduces the flow. For women, high motivation consistently leads to higher evacuation efficiency than normal motivation regardless of the bottleneck width. The time interval is significantly influenced by the bottleneck width, pedestrians’ gender and their interaction term. Increasing bottleneck width does not always lead to a decrease in density when men are highly motivated; while for women, wider bottlenecks alleviate congestion around the exit.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"14 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871095","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

Exact solution of the nonlinear boson diffusion equation for gluon scattering 胶子散射的非线性玻色子扩散方程的精确解

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-07-29 DOI: 10.1088/1742-5468/ad5a78

L Möhringer, G Wolschin

引用次数: 0

Experimental study on mechanical transfer regularity and step distance of individuals under different collision impulse 不同碰撞冲力下个体机械传递规律性和步距的实验研究

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-07-25 DOI: 10.1088/1742-5468/ad613c

Liangchang Shen, Haiyang Huang, Yushan Song and Wenguo Weng

{"title":"Experimental study on mechanical transfer regularity and step distance of individuals under different collision impulse","authors":"Liangchang Shen, Haiyang Huang, Yushan Song and Wenguo Weng","doi":"10.1088/1742-5468/ad613c","DOIUrl":"https://doi.org/10.1088/1742-5468/ad613c","url":null,"abstract":"In the process of emergency evacuation, the fall of an individual may lead to the instability of surrounding pedestrians. The evacuation routes would be obstructed by fallen pedestrians, thereby diminishing the evacuation efficiency and increasing the overall crowd risk. The purpose of this study is to explore the balance-recovery process of pedestrians under collision. The study conducted a series of experiments to obtain the total step distance and number of steps taken by individuals during the balance-recovery process under different impulses. The impulse applied by the unstable individual to the obstacle ahead for balance recovery was also measured. The gait characteristics and mechanical principles of the individuals in the balance-recovery process after collision force were analyzed. The results indicate that individuals can recover balance within a 90 cm step distance if the impulse received is in the range of 20–160 N s. The relationship between the step distance of an individual and the impulse received can be expressed as a quadratic function. When stepping is prohibited, the impulse applied by the individual to the obstacle ahead is approximately 1.85 times the impulse he received. However, if stepping is allowed, the dispersion of the impulse applied to the obstacle gradually decreases with increasing step space. Additionally, logistic regression models were constructed to calculate individual instability probabilities for different conditions based on the experimental data. These results can serve as a foundation method for evaluating the individual and group instability risk during emergency evacuation scenarios.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"16 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141772461","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