International Journal of Theoretical Physics最新文献_第10页

First Principles Exploration of N-V Point Defect Complexes in Graphane: Analysis of Energetic Stabilities and Electronic Properties 石墨烯中N-V点缺陷配合物的第一性原理研究：能量稳定性和电子性质分析

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-07 DOI: 10.1007/s10773-025-05904-y

H. Mapingire, C. Fwalo, R. E. Mapasha

{"title":"First Principles Exploration of N-V Point Defect Complexes in Graphane: Analysis of Energetic Stabilities and Electronic Properties","authors":"H. Mapingire, C. Fwalo, R. E. Mapasha","doi":"10.1007/s10773-025-05904-y","DOIUrl":"10.1007/s10773-025-05904-y","url":null,"abstract":"<div>In this study, we employ first principles calculations within the framework of density functional theory to comprehensively investigate the energetic stabilities and electronic properties of various nitrogen dopant-vacancy complexes: NCVH,  NCVCH,  NCHVH and NCHVCH in the graphane two-dimensional material. The creation of NCVH and NCHVH complexes require less energy than that of NCVCH and NCHVCH, according to the formation energy analysis. The binding energies analysis reveals that all the considered N-vacancy complexes are stable when compared to their isolated counterparts. Based on U-parameter values derivation, it is easier for NCHVH complex (1.09 eV) to undergo transition from one charge state to another as compared to NCVCH (2.52 eV). The N-vacancy complexes induce acceptor and donor states within the graphane band gap, which alters during transition states (0 to −1 or 0 to +1). This comparative study has provided fundamental insights into the possibilities of utilizing nitrogen-vacancy centers in graphane for band gap engineering and nano-technology tailored applications.</div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10773-025-05904-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solving New Potentials in Terms of Exceptional Orthogonal Polynomials and Their Supersymmetric Partners 用异常正交多项式及其超对称伙伴求解新势

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-07 DOI: 10.1007/s10773-024-05854-x

Satish Yadav, Rahul Ghosh, Bhabani Prasad Mandal

引用次数: 0

Optical Solitons and Dynamical Structures for the Zig-zag Optical Lattices in Quantum Physics 量子物理中之字形光晶格的光孤子和动力学结构

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-06 DOI: 10.1007/s10773-025-05902-0

Fatma Nur Kaya Sağlam, Bahadır Kopçasız, Kalim U. Tariq

引用次数: 0

Equivalence Relations in Quantum Theory: An Objective Account of Bases and Factorizations 量子理论中的等价关系：基础和因式分解的客观说明

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-05 DOI: 10.1007/s10773-025-05903-z

Christian de Ronde, Raimundo Fernández Mouján, César Massri

{"title":"Equivalence Relations in Quantum Theory: An Objective Account of Bases and Factorizations","authors":"Christian de Ronde, Raimundo Fernández Mouján, César Massri","doi":"10.1007/s10773-025-05903-z","DOIUrl":"10.1007/s10773-025-05903-z","url":null,"abstract":"<div>In orthodox Standard Quantum Mechanics (SQM) bases and factorizations are considered to define quantum states and entanglement in relativist terms. While the choice of a basis (interpreted as a measurement context) defines a state incompatible to that same state in a different basis, the choice of a factorization (interpreted as the separability of systems into sub-systems) determines wether the same state is entangled or non-entangled. Of course, this perspectival relativism with respect to reference frames and factorizations precludes not only the widespread reference to quantum particles but more generally the possibility of any rational objective account of a state of affairs in general. In turn, this impossibility ends up justifying the instrumentalist (anti-realist) approach that contemporary quantum physics has followed since the establishment of SQM during the 1930s. In contraposition, in this work, taking as a standpoint the logos categorical approach to QM —basically, Heisenberg’s matrix formulation without Dirac’s projection postulate— we provide an invariant account of bases and factorizations which allows us to to build a conceptual-operational bridge between the mathematical formalism and quantum phenomena. In this context we are able to address the set of equivalence relations which allows us to determine what is actually the same in different bases and factorizations.</div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184756","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

Dirac Fermions with Electric Dipole Moment and Position-dependent Mass in the Presence of a Magnetic Field Generated by Magnetic Monopoles 磁单极子产生磁场时具有电偶极矩和位置依赖质量的狄拉克费米子

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-05 DOI: 10.1007/s10773-025-05901-1

R. R. S. Oliveira

{"title":"Dirac Fermions with Electric Dipole Moment and Position-dependent Mass in the Presence of a Magnetic Field Generated by Magnetic Monopoles","authors":"R. R. S. Oliveira","doi":"10.1007/s10773-025-05901-1","DOIUrl":"10.1007/s10773-025-05901-1","url":null,"abstract":"<div>In this paper, we determine the bound-state solutions for Dirac fermions with electric dipole moment (EDM) and position-dependent mass (PDM) in the presence of a radial magnetic field generated by magnetic monopoles. To achieve this, we work with the ((2+1))-dimensional (DE) Dirac equation with nonminimal coupling in polar coordinates. Posteriorly, we obtain a second-order differential equation via quadratic DE. Solving this differential equation through a change of variable and the asymptotic behavior, we obtain a generalized Laguerre equation. From this, we obtain the bound-state solutions of the system, given by the two-component Dirac spinor and by the relativistic energy spectrum. So, we note that such spinor is written in terms of the generalized Laguerre polynomials, and such spectrum (for a fermion and an antifermion) is quantized in terms of the radial and total magnetic quantum numbers n and (m_j), and explicitly depends on the EDM d, PDM parameter (kappa ), magnetic charge density (lambda _m), and on the spinorial parameter s. In particular, the quantization is a direct result of the existence of (kappa ) (i.e., (kappa ) acts as a kind of “external field or potential”). Besides, we also analyze the nonrelativistic limit of our results, that is, we also obtain the nonrelativistic bound-state solutions. In both cases (relativistic and nonrelativistic), we discuss in detail the characteristics of the spectrum as well as graphically analyze its behavior as a function of (kappa ) and (lambda _m) for three different values of n (ground state and the first two excited states).</div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184757","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

Singular Lagrangians and the Hamilton-Jacobi Formalism in Classical Mechanics 经典力学中的奇异拉格朗日量与哈密顿-雅可比形式

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-03 DOI: 10.1007/s10773-025-05887-w

Luis Gerardo Romero Hernández, Jaime Manuel Cabrera, Ramón Eduardo Chan López, Jorge Mauricio Paulin Fuentes

{"title":"Singular Lagrangians and the Hamilton-Jacobi Formalism in Classical Mechanics","authors":"Luis Gerardo Romero Hernández, Jaime Manuel Cabrera, Ramón Eduardo Chan López, Jorge Mauricio Paulin Fuentes","doi":"10.1007/s10773-025-05887-w","DOIUrl":"10.1007/s10773-025-05887-w","url":null,"abstract":"<div>This work conducts a Hamilton-Jacobi analysis of classical dynamical systems with internal constraints. We examine four systems, all previously analyzed by David Brown: three with familiar components (point masses, springs, rods, ropes, and pulleys) and one chosen specifically for its detailed illustration of the Dirac-Bergmann algorithm’s logical steps. Including this fourth system allows for a direct and insightful comparison with the Hamilton-Jacobi formalism, thereby deepening our understanding of both methods. To provide a thorough analysis, we classify the systems based on their constraints: non-involutive, involutive, and a combination of both. We then use generalized brackets to ensure the theory’s integrability, systematically remove non-involutive constraints, and derive the equations of motion. This approach effectively showcases the Hamilton-Jacobi method’s ability to handle complex constraint structures. Additionally, our study includes an analysis of a gauge system, highlighting the versatility and broad applicability of the Hamilton-Jacobi formalism. By comparing our results with those from the Dirac-Bergmann and Faddeev-Jackiw algorithms, we demonstrate that the Hamilton-Jacobi approach is simpler and more efficient in its mathematical operations and offers advantages in computational implementation.</div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107936","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

Comparative Analysis of the Singularly Perturbed Generalized Burgers-Huxley Problem via Approximate Lie Symmetry and Exponentially Fitted Finite Element Method 奇摄动广义Burgers-Huxley问题的近似Lie对称与指数拟合有限元比较分析

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-03 DOI: 10.1007/s10773-025-05882-1

Anjali Kwatra, Vivek Sangwan, Rajesh Kumar Gupta

{"title":"Comparative Analysis of the Singularly Perturbed Generalized Burgers-Huxley Problem via Approximate Lie Symmetry and Exponentially Fitted Finite Element Method","authors":"Anjali Kwatra, Vivek Sangwan, Rajesh Kumar Gupta","doi":"10.1007/s10773-025-05882-1","DOIUrl":"10.1007/s10773-025-05882-1","url":null,"abstract":"<div>Singularly perturbed generalized Burgers-Huxley equation (SPGBHE) models nonlinear wave phenomena in fluid dynamics, combustion, and biological systems. This study addresses the solutions of SPGBHE through approximate Lie symmetry analysis (LSA) and finite element method (FEM), with rigorous comparison validating solutions obtained through both methodologies. The method of approximate symmetry, which involves expanding the infinitesimal generator in a perturbation series is implemented to solve the governing equation, yielding approximate infinitesimal generators essential for constructing the optimal system of Lie sub-algebra. A set of group invariant solutions is determined for each reduction derived from corresponding sub-algebras mentioned in the system. On the second part, exponentially fitted finite element method (EF-FEM) along with the explicit Euler scheme is implemented using a piecewise uniform Shishkin mesh to examine the equation from a numerical perspective. Stability and uniform convergence of outlined approach is discussed to provide credibility to the numerical scheme. Moreover, solutions derived through each technique are authenticated by firm comparison following a detailed error analysis, including error table and comparison plots. Visual representations of solution profiles for specific outcomes of LSA are also presented to see the impact of the singular perturbation parameter ((epsilon )) alongside other parameters.</div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108242","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

Thermodynamics on the Non-Commutative Dirac Oscillator with the Mie-Type Potential 具有mie型势的非交换狄拉克振子的热力学

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-01 DOI: 10.1007/s10773-025-05893-y

M. Qolizadeh, S. M. Motevalli, S. S. Hosseini

引用次数: 0

Renormalization Group Approach for Modified vdP Oscillator with (mathcal{P}mathcal{T}) Symmetric Non-Hermitian Interaction 具有(mathcal{P}mathcal{T})对称非厄米相互作用的改进vdP振子的重整化群方法

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2025-02-01 DOI: 10.1007/s10773-025-05896-9

Biswajit Bhowmick, Rohit Mahendra Shinde, Bhabani Prasad Mandal

引用次数: 0

Generalized (mathcal {Z})-Solitons on Magneto-Fluid Spacetimes in f(r)-Gravity 广义(mathcal {Z}) - f(r)-重力中磁流体时空上的孤子