International Journal of Theoretical Physics最新文献_第4页

On the Dark Matter Halo of the Milky Way: Anisotropic Pressure 银河系暗物质晕：各向异性压力

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-03 DOI: 10.1007/s10773-025-06090-7

Mithun Ghosh

引用次数: 0

The First Negative-order Matrix AKNS Flow and its Darboux Transformation 一阶负阶矩阵AKNS流及其达布变换

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-03 DOI: 10.1007/s10773-025-06102-6

Wen-Xiu Ma

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Experimenting with Quantum True Random Number Generators on NISQ Computers Using High-level Quantum Programming 用高级量子编程在NISQ计算机上实验量子真随机数生成器

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-03 DOI: 10.1007/s10773-025-06104-4

Vaishnavi Kumar

{"title":"Experimenting with Quantum True Random Number Generators on NISQ Computers Using High-level Quantum Programming","authors":"Vaishnavi Kumar","doi":"10.1007/s10773-025-06104-4","DOIUrl":"10.1007/s10773-025-06104-4","url":null,"abstract":"<div><p>Random numbers are a central problem in the disciplines of scientific simulations, cryptography, randomized algorithms, and secure communications. The software-generated pseudorandom bit sequence is fast enough but does not meet the required randomness quality requirements. For this reason, more intensive physical hardware techniques are being developed to generate a real random sequence. This study presented a method for producing quantum truly random bit sequences as the best physical implementation of qubits. The proposed algorithm is implemented in an IBM Quantum Experience (IBMQ) quantum computer. Implementation is done through the IBM software platform QISKit. Quantum state rotation gate X, rotation gate Z, and phase shift gate are used. It performs the superposition of the initial state and gives random numbers on measured. QISKit SDK qasm simulator, real chip seven qubit superconductivity based IBMQ 127 qubit quantum computer is used to run the suggested quantum circuit. The proposed algorithm’s accuracy, validity, and randomness applicability have been validated by restart experiments, autocorrelation analysis, National Institute of Standards and Technology (NIST) NIST SP 800-90B and NIST SP 800 − 22 verified with low gate requirements. The proposed method can be an attractive and appropriate choice in the Noisy Intermediate Scale Quantum (NISQ) technology age. Modern-generation noisy quantum computers can mimic the noisy environment of quantum channels while at the same time acting as a testbed to see how the protocol works on real hardware.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Effect of Rainbow Gravity, PDM, and Magnetic Field on Thermodynamics Properties of Charmonium and Bottomonium 彩虹重力、PDM和磁场对夏蒙铵和底摩铵热力学性质的影响

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-02 DOI: 10.1007/s10773-025-06101-7

Briant Sabathino Harya Wibawa, C. Cari, A. Suparmi

{"title":"Effect of Rainbow Gravity, PDM, and Magnetic Field on Thermodynamics Properties of Charmonium and Bottomonium","authors":"Briant Sabathino Harya Wibawa, C. Cari, A. Suparmi","doi":"10.1007/s10773-025-06101-7","DOIUrl":"10.1007/s10773-025-06101-7","url":null,"abstract":"<div><p>This study investigates the Klein-Gordon (KG) oscillator equation in the spacetime of a cosmic string under the influence of rainbow gravity, an external magnetic field, and a position-dependent mass (PDM). An analytical solution of the KG oscillator is derived, and the resulting energy equation is used to compute the numerical energy levels of charmonium and bottomonium for two types of rainbow functions. The computed values show good agreement with experimental data. Furthermore, the energy equation is used to evaluate the partition function, from which various thermodynamic properties of charmonium and bottomonium are derived. For rainbow function 1, increasing the inverse temperature parameter <span>(:beta:)</span> results in a decrease in the partition function, internal energy, and entropy, while the free energy increases. The specific heat capacity exhibits a peak before declining. For rainbow function 2, the partition function and free energy increase with <span>(:beta:)</span>, whereas internal energy and entropy decrease. The specific heat capacity again displays a non-monotonic behavior, rising to a maximum and then decreasing as <span>(:beta:)</span> increases. These results reveal how rainbow gravity, magnetic field, and PDM collectively influence the quantum and thermodynamic characteristics of relativistic quark systems.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Evolution of Entanglement Witness of Dicke State under Noise and Error Mitigation 噪声与误差抑制下Dicke态纠缠见证的演化

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-02 DOI: 10.1007/s10773-025-06107-1

Tomis Prajapati, Harsh Mehta, Shreya Banerjee, Prasanta K. Panigrahi, V. Narayanan

{"title":"Evolution of Entanglement Witness of Dicke State under Noise and Error Mitigation","authors":"Tomis Prajapati, Harsh Mehta, Shreya Banerjee, Prasanta K. Panigrahi, V. Narayanan","doi":"10.1007/s10773-025-06107-1","DOIUrl":"10.1007/s10773-025-06107-1","url":null,"abstract":"<div><p>The experimental verification of multipartite entangled states is essential for advancing quantum information processing. Entanglement witnesses (EWs) provide a widely used and experimentally accessible approach for detecting genuinely multipartite entangled states. In this work, we theoretically derive the entanglement witness for the four-qubit Dicke state and experimentally evaluate it on two distinct IBM 127-qubit Quantum Processing Units (QPUs), namely ibm_sherbrooke and ibm_brisbane. A negative expectation value of the witness operator serves as a sufficient condition for confirming genuine multipartite entanglement. We report the maximum (negative) values of the witness achieved on these QPUs as <span>(-0.178 pm 0.009)</span> and <span>(-0.169 pm 0.002)</span>, corresponding to two different state preparation protocols. Additionally, we theoretically investigate the effect of various noise channels on the genuine entanglement of a four-qubit Dicke state using the Qiskit Aer simulator. We show the behavior of the EW constructed under the assumption of Markovian and non-Markovian amplitude damping and depolarizing noises, bit-phase flip noise, and readout errors. We also investigate the effect of varying thermal relaxation time on the EW, depicting a bound on the <span>(T_1)</span> time required for successful generation of a Dicke State on a superconducting QPU.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 note on Reichenbach’s common cause completeness 关于莱辛巴赫公因完备性的注解

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-02 DOI: 10.1007/s10773-025-06089-0

Dominika Burešová

引用次数: 0

Jensen-Mercer and related Inequalities for Coordinated Convex Functions with their Computational Analysis and Applications 协调凸函数的Jensen-Mercer及相关不等式及其计算分析与应用

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-09-01 DOI: 10.1007/s10773-025-06085-4

Muhammad Toseef, Muhammad Aamir Ali

{"title":"Jensen-Mercer and related Inequalities for Coordinated Convex Functions with their Computational Analysis and Applications","authors":"Muhammad Toseef, Muhammad Aamir Ali","doi":"10.1007/s10773-025-06085-4","DOIUrl":"10.1007/s10773-025-06085-4","url":null,"abstract":"<div><p>In this article, we define the Jensen-Mercer inequality for coordinated convex functions. Defining Jensen-Mercer inequality on coordinates was a challenging problem for researchers working in the field of inequalities. Newly established inequality extends Jensen’s classical result to coordinate-wise convex functions, using Mercer-type conditions to derive bounds in multi-variable settings. It is instrumental in optimization and convex analysis for systems with interdependent variables under convex constraints. By use of a new definition, we establish Hermite–Hadamard-Mercer type inequalities for coordinated convex functions. Hermite–Hadamard-Mercer type inequality is the generalization of Hermite-Hadamard inequality, we can get Hermite-Hadamard inequality by taking endpoints in Hermite–Hadamard-Mercer type inequality. Also, we prove Midpoint–Mercer and Trapezoid–Mercer type inequalities on coordinates. The newly established inequalities are valid for the functions that are coordinated convex but may not be convex. Moreover, we give numerical examples to check the validity of newly established results and show that the bounds proved in this paper are better than the previously established results. The results of the study show that the inequalities hold for a wider range of functions. The use of new results can improve the accuracy of modeling and optimization of systems in fields such as economics, engineering, and physics. Also, we provide applications of the numerical integration methods of newly established results to develop the interest of the readers.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Study of Single Vector-like B Quark Production in (egamma) Collisions Through 2 b-Jets and 4 Light Jets Final States 2个B喷流和4个轻喷流最终态下(egamma)碰撞中单向量类B夸克产生的研究

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-08-30 DOI: 10.1007/s10773-025-06075-6

Qing-Guo Zeng

引用次数: 0

Practical Analytical Approaches to Soliton Solutions, Dynamical Properties and Chaotic Behaviors of the Stochastic Nonlinear Schrödinger Equation Under the Influence of Multiplicative White Noise 乘性白噪声影响下随机非线性Schrödinger方程孤子解、动力学性质和混沌行为的实用解析方法

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-08-29 DOI: 10.1007/s10773-025-06113-3

Na Tang, Guo-Ning Zhang

{"title":"Practical Analytical Approaches to Soliton Solutions, Dynamical Properties and Chaotic Behaviors of the Stochastic Nonlinear Schrödinger Equation Under the Influence of Multiplicative White Noise","authors":"Na Tang, Guo-Ning Zhang","doi":"10.1007/s10773-025-06113-3","DOIUrl":"10.1007/s10773-025-06113-3","url":null,"abstract":"<div><p>This paper investigates the soliton solutions, dynamic properties and chaotic behaviors of the generalized derivative stochastic nonlinear Schrödinger equation with multiplicative white noise. The model has a profound impact on the nonlinear optical phenomena. Firstly, the trial equation method is employed for mathematical analysis from which the solutions are derived straightforwardly using the direct integration method without additional assumptions. Secondly, a qualitative analysis of the equation is conducted to verify the existence of some special solutions. Based on the complete discrimination system for the polynomial method, this study successfully solves fourth- and fifth-degree polynomial equations and obtains richer and more comprehensive soliton solutions. Notably, stochastic averaging is adopted, which alters the periodic characteristics of the solution to exhibit more randomized and homogenized behaviors. Thirdly, the two-dimensional and three-dimensional graphs visually demonstrate the amplitude variations caused by the delay factor resulting from white noise. Finally, chaotic behaviors provide crucial theoretical support for nonlinear wave propagation under stochastic perturbations.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Analysis of an Axisymmetric Cylinder with Variable Thermal Conductivity and Point Loads in a Semi-Infinite Medium Via the Moore-Gibson-Thompson Model of Thermoelasticity 用Moore-Gibson-Thompson热弹性模型分析半无限介质中具有变导热系数和点载荷的轴对称圆柱体

IF 1.7 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-08-27 DOI: 10.1007/s10773-025-06098-z

Vikas Sharma, Dinesh Kumar Sharma, Nantu Sarkar

{"title":"Analysis of an Axisymmetric Cylinder with Variable Thermal Conductivity and Point Loads in a Semi-Infinite Medium Via the Moore-Gibson-Thompson Model of Thermoelasticity","authors":"Vikas Sharma, Dinesh Kumar Sharma, Nantu Sarkar","doi":"10.1007/s10773-025-06098-z","DOIUrl":"10.1007/s10773-025-06098-z","url":null,"abstract":"<div><p>This study investigates the influence of variable thermal conductivity on a homogeneous, isotropic, axisymmetric cylindrical structure within the framework of the Moore–Gibson–Thompson model of generalized thermoelasticity. Several thermoelastic models are employed to analyze the primary field variables, including temperature distribution, displacement, and stress components. The governing equations are formulated and solved using harmonic time variations and Hankel transforms, yielding solutions in the transformed domain. The inverse Hankel transform is computed numerically using Romberg integration, enhanced by an extended Simpson’s one-third rule with extrapolation for improved accuracy. The resulting system of equations is solved using the Gauss elimination method under appropriate boundary conditions. Numerical results are illustrated graphically with respect to radial and axial positions, demonstrating the impact of variable thermal conductivity and the comparative behavior of different thermoelastic models.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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