Chinese Journal of Physics最新文献

{"title":"Role of non-conserved gravity theory and electric charge in constructing complexity-free stellar models: A novel approach under non-minimal coupling","authors":"Tayyab Naseer","doi":"10.1016/j.cjph.2025.06.024","DOIUrl":"10.1016/j.cjph.2025.06.024","url":null,"abstract":"<div><div>This study explores the application of complexity factor within the context of Rastall gravity, exploring its implications on a static spacetime admitting spherical symmetry associated with anisotropic fluids under an electromagnetic field. The field equations are derived for a static charged sphere that provides a foundational framework for analyzing gravitational effects in this non-conserved theory. The mass function is formulated by incorporating both fluid and geometric parameters, offering insights into how mass distribution affects spacetime curvature. Through orthogonal decomposition of the Riemann tensor, a set of scalar quantities is obtained, referred to the structure scalars, which serve as indicators of celestial complexity. One specific scalar is then specified as the complexity factor, i.e., <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>T</mi><mi>F</mi></mrow></msub></math></span>, facilitating further analysis on its role in characterizing complex systems. The presence of unknowns in gravitational equations necessitates the imposition of constraints to facilitate their solution. To address this, <span><math><mrow><msub><mrow><mi>Y</mi></mrow><mrow><mi>T</mi><mi>F</mi></mrow></msub><mo>=</mo><mn>0</mn></mrow></math></span> alongside three distinct conditions are employed which yield diverse stellar models. A comprehensive graphical analysis is conducted using multiple values of the Rastall and charge parameters. Notably, the findings of this study align with those predicted by Einstein’s theory. More appealingly, the Rastall theory demonstrates its superiority in the presence of charge under model 2 when it is compared with the general theory of relativity.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1212-1231"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Dark matter admixed relativistic stars: Structural properties and tidal Love numbers","authors":"Takol Tangphati ,&nbsp;Grigoris Panotopoulos ,&nbsp;Ayan Banerjee ,&nbsp;Anirudh Pradhan","doi":"10.1016/j.cjph.2025.06.023","DOIUrl":"10.1016/j.cjph.2025.06.023","url":null,"abstract":"<div><div>We study the impact of bosonic, self-interacting dark matter on structural properties and tidal deformabilities of compact stars. As far as the gravitational theory is concerned, we assume Einstein’s gravity in four dimensions with a vanishing cosmological constant. Regarding matter content, we consider a state-of-matter to a linear form of equation-of-state (EoS), while for dark matter we assume a quartic scalar potential, which implies a certain non-linear EoS obtained long time ago. Adopting the two-fluid formalism we integrate the structure equations as well as the Riccati equation for the metric even perturbations imposing appropriate initial conditions at the center of the stars and matching conditions at their surface. We compute the stellar mass and radius, factor of compactness and dimensionless deformability varying several free parameters of the model studied here. Tidal deformability and the corresponding tidal Love number determine the imprint of the underlying EoS within the signals emitted during binary coalescences, and it is expected to be altered due to the presence of dark matter inside the objects. We find that in all cases considered here, the dimensionless deformability of the canonical stellar mass remains lower than the upper bound, <span><math><mrow><msub><mrow><mi>Λ</mi></mrow><mrow><mn>1</mn><mo>.</mo><mn>4</mn></mrow></msub><mo>&lt;</mo><mn>800</mn></mrow></math></span>. We also look at the stability of these stars based on the Harrison–Zeldovich-Novikov criterion under various conditions. It is observed that the presence of dark matter implies significantly lower highest stellar mass, and also smaller and more compact stars for a given stellar mass.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1329-1343"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Going beyond the Black–Scholes option pricing model: Financial rogue waves in quantum mechanics","authors":"Lingfei Li ,&nbsp;Minting Zhu ,&nbsp;Jingyu Wu ,&nbsp;Mancang Wang ,&nbsp;Yingying Xie","doi":"10.1016/j.cjph.2025.06.029","DOIUrl":"10.1016/j.cjph.2025.06.029","url":null,"abstract":"<div><div>This paper proposes a nonlinear alternative for the Black–Scholes option pricing model defined as the Schrödinger equation. The Black–Scholes equation is obtained from the Schrödinger equation in the leading-order approximation of an asymptotic perturbation theory under the assumptions of weak nonlinearity and weak dispersion. It models the controlled Brownian motion of the financial market and describes the option price wave function in quantum mechanic origin. Here, we analytically predict the existence of a family of financial rogue wave solutions of the Black–Scholes equation in the form of complex rational functions by using symbolic computation. The obtained solutions are composed of a single symmetric soliton or several solitary peaks. The existence of non-zero offset parameters provides nontrivial alterations to higher order solutions as they would decompose into first order ones that can be used to simulate the evolution of financial risks. The financial rogue wave solution demonstrates a condition that investors may face considerable risk or return in the financial market, which might be an actual theoretical basis for its existence. Our study is the first to prove the connection between option pricing and quantum mechanics, which opens a novel path for the excitation and control of financial waveforms of quantum mechanic footprint and extreme financial crisis. Currently, there are no similar studies, making this work crucial and significant for the advancement of quantum finance.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 188-209"},"PeriodicalIF":4.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Coupled electromagnetohydrodynamic and heterogeneous reactive solute transport in non-Newtonian third-grade fluid flow through a microchannel","authors":"Raju Sen,&nbsp;Kajal Kumar Mondal,&nbsp;Nabanita Dey,&nbsp;Rishi Raj Kairi","doi":"10.1016/j.cjph.2025.06.032","DOIUrl":"10.1016/j.cjph.2025.06.032","url":null,"abstract":"<div><div>In this work, we investigated the microfluidic solute dispersion in electromagnetohydrodynamics (EMHD) flow of third-grade fluid in parallel plates microchannel. On account of the complex non-linearity of the Navier-Stokes equation, a series solution is introduced for the derivation of an analytical expression for a velocity distribution. For microscale system design, optimizing surface area and mass transfer efficiency is crucial. Skin friction contours aid in this evaluation. Additionally, the time-dependent convection–diffusion equation is analyzed using Aris’s method of moments to formulate the moment equations, which are solved through an implicit finite difference scheme. The mean concentration distribution of the tracers is calculated using the first four central moments expressed in a Hermite polynomial. Moreover, the two-dimensional concentration distribution is represented using contour plots, with the analysis based on Gill’s work on asymptotic expansions. From our investigation, it is apparent that higher values of the third-grade parameters (<span><math><mi>σ</mi></math></span>) improve the non-Newtonian characteristics and result in an obstruction to solute transport in the microchannel. Strong boundary absorption significantly accelerates tracer depletion in the microchannel, leading to an exponential reduction in contaminant retention over time. A higher electric field leads to a strong electroconductive effect to facilitate the mobility and velocity of charged particles that interact intensively with the medium, resulting in increased mixing and improved solute transport. Such a system strongly affects the ion separation process based on both charge and size, so increasing the strength of conduction field separation becomes more efficient. The analysis presents a highly complex understanding of solute dispersion control through a microfluidic system, offering modern application of the mechanism in drug delivery, blood flow, lab-on-a-chip devices, and cell separation.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1385-1409"},"PeriodicalIF":4.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"An extended LWR non-lane-based-discipline model for light vehicle traffic flow analysis incorporating driver behavior","authors":"Farhad Hadadi ,&nbsp;Iman Aghayan","doi":"10.1016/j.cjph.2025.06.049","DOIUrl":"10.1016/j.cjph.2025.06.049","url":null,"abstract":"<div><div>Non-lane-based discipline is a common driving behavior in traffic flow, particularly in developing countries such as Iran. Under these conditions, driving behaviors change, affecting overall traffic dynamics and making traffic flow prediction more complex. This complexity leads to inaccurate estimates of lane capacity. To improve flow prediction under non-lane-based traffic conditions, this study first examines the dynamic traffic characteristics of non-lane-based discipline, focusing on microscopic variables such as lateral separation distance (LSD) and time headway on an urban multilane highway in Tehran, Iran. Second, an extended Lighthill-Whitham-Richards (LWR) model is proposed to analyze the effects of LSD on traffic flow characteristics. Numerical simulations are conducted using an adjusted upwind scheme, and a stability analysis is performed for the scheme. The model is validated using field data from Iran, specifically for light vehicles (LVs). The results indicate that, under staggered-following behavior, time headways of LV drivers decrease as LSD values increase. The proposed LWR model effectively simulates smooth transitions in density and speed evolution, capturing shock and rarefaction waves in the middle lane. Under non-lane-based discipline, the model accurately represents the gradual deceleration in the jam phase for shock waves and the gradual acceleration in the free flow condition for rarefaction waves. These transitions reflect the real-world continuous traffic flow, preventing sudden acceleration and deceleration of LVs. Furthermore, under non-lane-based traffic conditions with the maximum LSD parameter, lane capacity and jam density in the middle lane increase by 61% and 60%, respectively, compared to lane-based conditions. The model's simulated results were validated using real-world data, demonstrating its effectiveness in predicting the impact of non-lane-based discipline on traffic flow.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 591-606"},"PeriodicalIF":4.6,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Coating with Newtonian fluid by a two-parameter blade family leading to exact dynamic and thermal solutions","authors":"Mustafa Turkyilmazoglu ,&nbsp;Abdulaziz Alotaibi","doi":"10.1016/j.cjph.2025.06.007","DOIUrl":"10.1016/j.cjph.2025.06.007","url":null,"abstract":"<div><div>This study utilizes mathematical analysis to explore the classic phenomenon of coating by a thin fluid layer between a blade and a moving substrate, with the aim of uncovering new blade functions. Through fluid flow analysis, we derive a two-parameter family of blade geometries encompassing the widely studied cases of simple planar and exponential blades. By solving the associated momentum, thermal, and pressure fields in closed-form, we obtain explicit expressions for key engineering quantities of interest, including pressure gradient, load, film thickness, drag, and Nusselt numbers on both the substrate and the blade. These analytical formulas provide powerful tools for designing blades that effectively influence the physical and mechanical processes of coating, ultimately determining the desired film thickness. For instance, our analysis reveals that convex blade geometries generate lower load and drag, while concave geometries offer smoother fluid contact, leading to thinner film thicknesses and enhanced heat transfer.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1191-1202"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Constraining radii and stability of neutron stars in 4D Einstein–Gauss–Bonnet gravity","authors":"N. Priyobarta ,&nbsp;Ksh. Newton Singh ,&nbsp;S.K. Maurya ,&nbsp;B. Mishra","doi":"10.1016/j.cjph.2025.06.022","DOIUrl":"10.1016/j.cjph.2025.06.022","url":null,"abstract":"<div><div>In this paper, we have investigated the effects of Gauss–Bonnet extension on Einstein gravity in 4-dimensions. Four different equation of state, namely SLy4, APR4, FPS and Togashi are considered. These equation of state are used to model the massive neutron stars like PSR J0740+6620, PSR J1959+2048, PSR J1810+1744, PSR J2215+5135 and GW190814, which are in the neutron star-black hole mass gap. We have calculated the mass and radius through the <span><math><mrow><mi>M</mi><mo>−</mo><mi>R</mi></mrow></math></span> curves for different values of the Gauss–Bonnet coupling parameter for four different equation of state to examine the upper limit of masses that fall within the mass gap. Our results show that the positive branch of <span><math><mi>α</mi></math></span> is suitable for explaining the existence of massive neutron stars in the mass gap. Bondi’s and static stability criteria confirm the stability of these massive neutron stars. In fact, an increase in Gauss–Bonnet coupling strength improves the stability of these massive neutron stars. Furthermore, the surface redshift of these massive neutron stars is below the maximum limit, i.e. <span><math><mrow><msub><mrow><mi>Z</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>≤</mo><mn>2</mn></mrow></math></span>. Finally, we have used the <span><math><mrow><mi>M</mi><mo>−</mo><mi>R</mi></mrow></math></span> curves with the observed masses to predict the radii of PSR J2215+5135, PSR J1959+2048, PSR J1810+1744, PSR J0740+6620 and GW190814 in general relativity and 4D Einstein–Gauss–Bonnet gravity. The predicted radii are in agreement with the constraints from the GW170817 event. Lastly, the maximum observed NS mass fits in the <span><math><mrow><mi>M</mi><mo>−</mo><mi>R</mi></mrow></math></span> curves, implying that the range of <span><math><mi>α</mi></math></span> should be somewhere around 0 to 5 <span><math><msup><mrow><mtext>km</mtext></mrow><mrow><mn>2</mn></mrow></msup></math></span>.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1164-1177"},"PeriodicalIF":4.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Exact formulation and solution of micropolar fluid dynamics in radiative and slip-influenced porous surface","authors":"Syed Saqib Shah ,&nbsp;Ali Raza ,&nbsp;Syed Hammad Shah","doi":"10.1016/j.cjph.2025.06.014","DOIUrl":"10.1016/j.cjph.2025.06.014","url":null,"abstract":"<div><div>The current investigation offers an exhaustive analysis of the complex behaviour of velocity slip in a fluid flow over a deformable porous surface, subject to both uniform and progressively elevated thermal conditions. Through the utilization of boundary layer approximations and the application of similarity transformations, the fundamental governing equations are reformulated as a system of coupled nonlinear differential equations. These equations are meticulously solved to derive exact solutions that capture the nuanced interplay between heat transfer and fluid dynamics across a wide spectrum of physically significant parameters. The existence, uniqueness, or multiplicity of these solutions hinges critically on key variables such as mass transfer rates and micropolar fluid effects. Specifically, the mass transfer parameter serves as a threshold, demarcating conditions where solutions may either exist or fail to emerge. In the case of a stretching surface, a singular solution is identified, while for a contracting surface, multiple distinct solutions are observed. Moreover, the study delves into exact solutions for heat transfer and fluid flow behaviour under select parametric scenarios, offering closed-form expressions for pivotal variables including skin friction, rotational velocity, heat flux, fluid velocity, and the reduced Nusselt number. These expressions are further visualized through detailed graphical representations, shedding light on the key physical phenomena governing the flow regime. Key findings of the research reveal that microstructural effects significantly enhance the rotational behaviour of the fluid, while thermal radiation notably alters the temperature distribution near the surface. Slip conditions lead to thinner boundary layers, affecting both heat and momentum transfer rates. These insights have practical implications in areas such as advanced thermal insulation, microfluidics, biomedical flows, and energy systems involving porous structures.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 247-258"},"PeriodicalIF":4.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Memristor-coupled circuits for neurons without capacitive variable","authors":"Qun Guo ,&nbsp;Zhao Lei ,&nbsp;Guodong Ren ,&nbsp;Jun Ma","doi":"10.1016/j.cjph.2025.06.043","DOIUrl":"10.1016/j.cjph.2025.06.043","url":null,"abstract":"<div><div>A capacitor can fit the capacitive property of the cell membrane, and it becomes an important electronic component for building neural circuits. Within this study, a simple neural circuit is proposed without using capacitor, while two inductors are connected with a memristor in parallel. Applying external stimulus can excite the neural circuit for presenting various firing patterns. A new scale transformation for reference time is suggested for obtaining an equivalent memristive neuron as a nonlinear oscillator. Energy function and stability are discussed in theoretical way, and numerical results are carried for detecting coherence resonance under noisy disturbance. It provides clues to design reliable neural circuits when capacitor is not available or breakdown in the capacitor occurs.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 653-672"},"PeriodicalIF":4.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"An authenticated quantum dialogue scheme based on a one-way quantum channel","authors":"Jia-Hao Zhang ,&nbsp;Nian Xue ,&nbsp;Xin Huang ,&nbsp;Xiao-Ling Yu ,&nbsp;Wan-Cheng Liu ,&nbsp;Yong-Feng Dai","doi":"10.1016/j.cjph.2025.06.020","DOIUrl":"10.1016/j.cjph.2025.06.020","url":null,"abstract":"<div><div>In this paper, a novel authenticated quantum dialogue based on a one-way quantum channel is proposed. In this scheme, one party prepares some six-particle cluster states to send particle sequences to the other party via a one-way quantum channel; both parties perform quantum logic gate operations and measurement operations based on their respective secret information and speculate the initial state to announce the classical information; and finally, both parties decrypt to obtain the other party’s secret information and complete verification and authentication. The one-way quantum channel reduces the risk of transmission losses and errors, and authentication and verification enhance the robustness of this scheme. The feasibility of this scheme in quantum computing has been verified using the IBM Qiskit framework. The security analysis shows that this scheme can resist active and passive attacks from adversaries. In addition, we analyze the deviation of the output state of this scheme and demonstrate its security using formal verification methods under noise. The proposed scheme has relative efficiency and safety advantages over similar schemes.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1116-1128"},"PeriodicalIF":4.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}