International Journal of Theoretical Physics最新文献

{"title":"Strong Gravitational Lensing and Shadows by Quantum Schwarzschild Black Hole in Homogeneous Plasma","authors":"Rukkiyya V P,&nbsp;Sini R","doi":"10.1007/s10773-025-05940-8","DOIUrl":"10.1007/s10773-025-05940-8","url":null,"abstract":"<div><p>In this paper, we investigate the strong gravitational effects of a quantum Schwarzschild black hole in the presence of homogeneous plasma, focusing on the impact of the polymerization parameter <span>(lambda )</span>. The analytical expression for the deflection angle in a strong field limit in a quantum Schwarzschild black hole surrounded by homogeneous plasma is derived. It is found that both the polymerization parameter <span>(lambda )</span> and the presence of uniform plasma can lead to an increase in the strong field parameters <span>(overline{a})</span> and <span>(overline{b})</span> and deflection angle <span>(alpha )</span>(b). Further, we performed the numerical calculation for the lensing observables, such as the angular position of the innermost image, the angular separation between the outermost image and the remaining image, the relative magnification, and the time delay between images on opposite sides of the lens for the supermassive black hole SgrA* in strong field limit, considering the effects of homogeneous plasma. We also studied the effect of plasma on the radius of the shadow. In conclusion, the polymerization parameter <span>(lambda )</span> and the presence of homogeneous plasma significantly affect the characteristics of shadows and strong gravitational lensing.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583479","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}

{"title":"Model of a Static, Spherically Symmetric, Charged Star with Anisotropic Stress and Its Complexity Analysis","authors":"Arpita Ghosh,&nbsp;Satarupa Barman,&nbsp;K Komathiraj,&nbsp;Ranjan Sharma","doi":"10.1007/s10773-025-05941-7","DOIUrl":"10.1007/s10773-025-05941-7","url":null,"abstract":"<div><p>Relevance of the ‘complexity factor’ in the studies of relativistic self-gravitating objects has become an area of intense research in recent years. To investigate the role of various factors contributing to the ‘complexity factor’ and subsequent occurrence of ‘cracking’ within a self-gravitating star, in this paper, we develop a new class of exact solutions to a spherically symmetric and static stellar configuration in the presence of charge and anisotropic pressure. Some of the stellar models studied earlier are shown to be sub-class our solutions. Making use of one particular class of solutions, we analyze the impacts of charge and anisotropic stress on the complexity factor of a given stellar configuration where the complexity factor is interpreted in terms of the definition put forward by Herrera [<i>Phys. Rev. D</i> <b>97</b> (2018) 44010]. While, even in the presence of charge and anisotropic stress of an inhomogeneous stellar configuration, the complexity factor might vanish, we show that the complexity factor usually increases in the presence of charge and anisotropy.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583496","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}

{"title":"Exploring Light Deflection and Black Hole Shadows in Rastall Theory with Plasma Effects","authors":"Riasat Ali,&nbsp;Xia Tiecheng,&nbsp;Rimsha Babar,&nbsp;Ali Övgün","doi":"10.1007/s10773-025-05942-6","DOIUrl":"10.1007/s10773-025-05942-6","url":null,"abstract":"<div><p>In this article, we examine the gravitational deflection of particles in curved spacetime immersed in perfect fluid in the context of Rastall theory. We propose an infinite region approach to Gibbons-Werner to avoid singularity, given that the integral region is generally infinite. In the Rastall theory framework, the black hole solutions in the dust field are studied. Additionally, we check the deflection angle from this spacetime under the influence of plasma. Furthermore, we analytically compute plasma’s impact on a black hole shadow using a ray-tracing approach and Hamiltonian equation. Hence, the light ray motion equations are independent of the plasma’s velocity. It is assumed that plasma is a dispersive medium, pressureless and non-magnetised, and the plasma particle density corresponds to particle accumulation. The supermassive black hole’s shadow and emitted energy are explored when plasma falls radially from infinity onto the black hole.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581197","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}

{"title":"On Local Unitary Equivalence of Multipartite Quantum States","authors":"Yanjun Chu,&nbsp;Keke Zhang,&nbsp;Mengli Liu","doi":"10.1007/s10773-025-05939-1","DOIUrl":"10.1007/s10773-025-05939-1","url":null,"abstract":"<div><p>Local unitary equivalence is an important ingredient for quantifying and classifying entanglement. For multipartite quantum states, the verification of local unitary equivalence is still a challenging problem. With the aid of fixed point unitary subgroup and tensor decomposability of certain unitary matrices, we derive the necessary and sufficient conditions for the local unitary equivalence of multipartite quantum states. Moreover, we also present several specific examples to illustrate the operability of our criterion.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564427","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}

{"title":"Self-distributive Structures in Physics","authors":"Tobias Fritz","doi":"10.1007/s10773-025-05909-7","DOIUrl":"10.1007/s10773-025-05909-7","url":null,"abstract":"<div><p>It is an important feature of our existing physical theories that observables generate one-parameter groups of transformations. In classical Hamiltonian mechanics and quantum mechanics, this is due to the fact that the observables form a Lie algebra, and it manifests itself in Noether’s theorem. In this paper, we propose <i>Lie quandles</i> as the minimal mathematical structure needed to express the idea that observables generate transformations. This is based on the notion of a quandle used most famously in knot theory, whose main defining property is the self-distributivity equation <span>(x triangleright (y triangleright z) = (x triangleright y) triangleright (x triangleright z))</span>. We argue that Lie quandles can be thought of as nonlinear generalizations of Lie algebras. We also observe that taking convex combinations of points in vector spaces, which physically corresponds to mixing states, satisfies the same form of self-distributivity.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564428","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}

{"title":"An Invariant Optical Soliton Wave Study on Integrable Model: A Riccati-Bernoulli Sub-Optimal Differential Equation Approach","authors":"Waqas Ali Faridi,&nbsp;Mujahid Iqbal,&nbsp;Haitham A. Mahmoud","doi":"10.1007/s10773-025-05929-3","DOIUrl":"10.1007/s10773-025-05929-3","url":null,"abstract":"<div><p>The double-chain deoxyribonucleic acid model, which is important to the retention and transfer of genetic material in biological domains, is examined in this study. It is important because, it bridges the gap between theoretical physics and molecular biology by offering a more thorough and precise explanation of DNA behavior. In this model, the bottom combination represents hydrogen bonds between base pairs in the two long, evenly elastic filaments that represent the two polynucleotide chains of the deoxyribonucleic acid molecule. The Lie symmetry analysis is used to explain the Lie invariance criteria. This leads to a four-dimensional Lie algebra where the translation point symmetries in space and time correlate with the conservation of mass and energy, respectively, and the remaining point symmetries are dilation and scaling. The double-chain deoxyribonucleic acid partial differential model is reduced to an ordinary differential equation, and built Lie subalgebras are found first, along with invariant closed-form solutions. The Cauchy problem for the double-chain deoxyribonucleic acid model cannot be solved by the inverse scattering transform method; therefore, the analytical Riccati-Bernoulli suboptimal differential equation approach technique is used to build the exact solution. The appropriate parametric values are taken in contour, two, and three dimensions to graphically illustrate the solution. A physically meaningful and intuitive interpretation of the system dynamics is required in order to make the Hamiltonian function under consideration easier to comprehend and analyze. One of the numerous conservation principles commonly seen in systems defined by a Hamiltonian function is energy conservation. The conservation laws are determined for the model under consideration, which are essential for deciphering and solving complex problems and are used to illustrate deep understandings of how physical systems behave. Understanding the stability and long-term behavior of the system depends on these preserved quantities. To assess the governing system’s sensitivity, a sensitive analysis is offered.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10773-025-05929-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553855","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}

{"title":"Exploration of the Soliton Solution of Nonlinear Equations by Modified Simple Equation Method","authors":"A. K. M. Kazi Sazzad Hossain,&nbsp;M. Mehedi Hasan,&nbsp;M. Ismail Hossain,&nbsp;M. Kamrul Islam,&nbsp;M. Ali Akbar","doi":"10.1007/s10773-025-05933-7","DOIUrl":"10.1007/s10773-025-05933-7","url":null,"abstract":"<div><p>This study addresses the challenge of derivig exact and soliton solutions for nonlinear evolution equations, which are essential for understanding complex phenomena in science, applied mathematics, and mathematical physics. Nonlinear evolution equations such as the ubiquitous Korteweg-de Vries equation and the Hirota-Ramani equation were studied due to their significant applications in modeling wave propagation, fluid dynamics, optics, plasma physics, and nonlinear dynamical systems. The modified simple equation method was employed, a strong method known for its consistency, efficiency, and effectiveness in deriving traveling wave solutions. Using this method, we obtained various solution types, including bell-shaped solitons, anti-bell-shaped solitons, kink-shaped solutions, pulse-shaped solitons, and soliton solutions. These results enhance our ability to predict system behavior under diverse conditions and extend the understanding of nonlinear systems. The novelty of this work lies in the improved applicability and performance of the modified simple equation method compared to existing methods, offering a more comprehensive framework for analyzing nonlinear evolution equations and advancing prior research in the field.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554091","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}

{"title":"Quantum Teleportation Using Symmetric States as Quantum Channel","authors":"Jagat Ram,&nbsp;Dev Dutt,&nbsp;Shashi K. Dhiman","doi":"10.1007/s10773-025-05910-0","DOIUrl":"10.1007/s10773-025-05910-0","url":null,"abstract":"<div><p>The subsets of Dicke states are highly entangled symmetric states known as the dihedral <span>(D_{8})</span>- symmetric states having the robust entanglement properties. In this work, we propose a quantum teleportation protocol for teleporting an arbitrary two-qubit state, a Bell-state and a Bell-like state using <span>(D_{8})</span>-symmetric entangled states as channel. The quantum circuits for the proposed teleportation protocol have been implemented on the IBM quasm-simulator and the results obtained confirm the successful execution of the protocol. In addition, the quantum circuit for an arbitrary two-qubit state has also been run on the real 127-qubit IBM Eagle quantum processor. Furthermore, by performing the quantum state tomography, the arbitrary two-qubit teleported state has been reconstructed at the Bob’s end with a 0.65 fidelity. The effects of three different noise types—amplitude damping, phase-flip, and bit-flip—on the proposed teleportation protocol have also been investigated. Additionally, a security study of the protocol against both internal and external attacks has been conducted.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554092","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}

{"title":"Quantum Walks under Superposition of Causal Order","authors":"Prateek Chawla,&nbsp;Shrikant Utagi,&nbsp;C. M. Chandrashekar","doi":"10.1007/s10773-025-05921-x","DOIUrl":"10.1007/s10773-025-05921-x","url":null,"abstract":"<div><p>We set the criteria under which superposition of causal order can be incorporated into quantum walks. In particular, we show that only periodic quantum walks or those with at least one disorder exhibit Superposition of causal order under the action of ‘quantum switch’. We exemplify our results with a simple example of two-period discrete-time quantum walks. In particular, we observe that periodic quantum walks exhibit causal asymmetry pertaining to the dynamics of the reduced coin state: the dynamics are more non-Markovian for one temporal order than the other. We also note that the non-Markovianity of the reduced coin state due to indefiniteness in causal order tends to match the dynamics of a particular temporal order of the coin state. We substantiate our results with numerical simulations.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10773-025-05921-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533066","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}

{"title":"The Influence of Global Monopole Space-time on Bound States, Scattering States and Thermodynamic Functions with Manning-Rosen Potential","authors":"H. I. Alrebdi,&nbsp;A. N. Ikot,&nbsp;U. S. Okorie,&nbsp;R. Horchani,&nbsp;G. J. Rampho","doi":"10.1007/s10773-025-05930-w","DOIUrl":"10.1007/s10773-025-05930-w","url":null,"abstract":"<div><p>In this study, the analytical eigensolutions of the radial Schrödinger equation with a point-like global monopole under the combined Manning-Rosen potential and screened Coulomb self-interaction potential has been investigated. The Greene-Aldrich approximation was used to overcome the centrifugal barrier which allows for the derivation of the energy and wave function in closed form. The solution of the energy and wave function were applied to investigate the scattering phase shift and thermodynamics function variations with topological defect parameter, quantum numbers and temperature, respectively. The results reveal that the energy eigenvalues and wave function amplitudes are influenced by the quantum numbers and the topological defect parameters. The shift in energy eigenvalues observed are caused by the particle collisions that exist in the system. The scattering phase shifts were found to be sensitive to the rotational quantum numbers and topological defect values. The thermodynamic plots exhibit high dependency on the temperature and topological defect parameters considered. Specific observation is the Schottky anomaly which exists uniquely for the topological defect values at low temperatures. Our results agree with occurrences in physical phenomenon, as recorded in literatures.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10773-025-05930-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533065","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}