International Journal of Theoretical Physics最新文献_第8页

Phase Transitions and Quantum Correlations in Heisenberg XXZ Spin Chains 海森堡XXZ自旋链中的相变和量子关联

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-08 DOI: 10.1007/s10773-026-06431-0

Mounaim Hamdoune, Mohammed Daoud

{"title":"Phase Transitions and Quantum Correlations in Heisenberg XXZ Spin Chains","authors":"Mounaim Hamdoune, Mohammed Daoud","doi":"10.1007/s10773-026-06431-0","DOIUrl":"10.1007/s10773-026-06431-0","url":null,"abstract":"<div><p>We present a comprehensive investigation of thermal quantum correlations in a two-qubit Heisenberg XXZ spin-1/2 chain subject to Dzyaloshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions oriented along the <i>z</i>-axis. The study focuses on the characterization of non-classical correlations at thermal equilibrium using two complementary discord-type quantifiers: trace distance discord (TDD) and local quantum uncertainty (LQU). We derive explicit analytical expressions for these quantifiers in the thermal state regime and systematically analyze their dependence on temperature, exchange coupling, spin-orbit interactions, and anisotropy parameters. A central contribution of this work is the identification and characterization of quantum phase transitions induced by the competition between different interaction terms. Our results demonstrate that both the antisymmetric DM and symmetric KSEA contributions from spin-orbit coupling significantly enhance thermal quantum correlations, while temperature acts as a decoherence mechanism that degrades these correlations. Furthermore, we establish clear connections between the critical behavior of quantum correlations and the underlying phase structure of the system. The interplay between different interaction parameters reveals fascinating quantum phase transitions characterized by non-analytic behaviors in the correlation measures. Our findings provide valuable insights into the manipulation and control of quantum correlations in spin-based quantum information processing architectures.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751249","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

Imprints of Modified Gravity on the Stability of Hybrid Stars 修正重力对混合恒星稳定性的影响

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-06 DOI: 10.1007/s10773-026-06435-w

M. Sharif, Iqra Ibrar

{"title":"Imprints of Modified Gravity on the Stability of Hybrid Stars","authors":"M. Sharif, Iqra Ibrar","doi":"10.1007/s10773-026-06435-w","DOIUrl":"10.1007/s10773-026-06435-w","url":null,"abstract":"<div><p>The present study investigates static anisotropic hybrid-star configurations containing hadronic matter and strange quark matter in the framework of <span>(f(mathbb {Q},mathcal {T}))</span> gravity, where <span>(mathbb {Q})</span> is the non-metricity scalar and <span>(mathcal {T})</span> denotes the trace of the energy-momentum tensor. The Finch-Skea spacetime geometry is adopted to construct exact solutions of the modified field equations. The physical viability of the resulting stellar model is examined through a detailed graphical analysis of the metric potentials, matter variables, radial and tangential pressures, anisotropic contribution, radial gradients, quark-sector density and pressure components, equation of state parameter, mass profile, and energy conditions. In addition, the stability of the configuration is tested by considering the compactness factor, gravitational redshift, sound-speed constraints, Herrera cracking condition, and adiabatic index. The analysis is carried out for the compact object EXO 1785-248, whose observed mass and radius are taken as <span>(1.3^{+0.2}_{-0.2}M_odot )</span> and <span>(8.849^{+0.4}_{-0.4},textrm{km})</span>, respectively. The obtained results indicate that the considered <span>(f(mathbb {Q},mathcal {T}))</span> model can provide a consistent theoretical setting for describing the internal structure and stability behavior of hybrid stars.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750922","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

Generalized Fractional Hadamard and Milne-Type Inequalities for Strongly Multiplicative Convex Functions with Applications 强乘法凸函数的广义分数Hadamard和milne型不等式及其应用

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-06 DOI: 10.1007/s10773-026-06437-8

Tahir Rasheed, ZhenBin Fan

{"title":"Generalized Fractional Hadamard and Milne-Type Inequalities for Strongly Multiplicative Convex Functions with Applications","authors":"Tahir Rasheed, ZhenBin Fan","doi":"10.1007/s10773-026-06437-8","DOIUrl":"10.1007/s10773-026-06437-8","url":null,"abstract":"<div><p>In this paper, we introduce and investigate a new class of strongly multiplicative convex functions (<span>(textsf {s}.textsf {m}.textsf {c}.textsf {f})</span>s) within the framework of multiplicative calculus. By employing multiplicative k-Riemann-Liouville (<span>(mathcal {R}_{ie})</span>-<span>(mathcal {L}_{io})</span>) fractional integrals (<span>(mathcal {F}_{r})</span>-<span>(mathcal {I}s)</span>), we establish several new fractional Hermite-Hadamard (<span>(mathcal {H}_{er})</span>-<span>(mathcal {H}_{ad})</span>) type inequalities for (<span>(textsf {s}.textsf {m}.textsf {c}.textsf {f})</span>s). The obtained results are further extended to product and quotients involving <span>(textsf {s}.textsf {m}.textsf {c})</span> and strongly multiplicative concave functions. In addition, new Milne-type inequalities are derived in the setting of multiplicative fractional calculus. By suitable selections of the involved parameters, a variety of known inequalities from the literature can be derived as special cases of obtained results. The validity and effectiveness of the proposed inequalities are illustrated through suitable examples and graphical interpretations. Furthermore, applications to special means and related special functions are provided to demonstrate the applicability of the developed theory. The presented results generalize and unify a number of earlier contributions in fractional integral inequalities and provide new perspectives in the study of multiplicative fractional calculus and convex analysis.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750604","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

Joint Photon Ring, ISCO and Scalar Barrier Probes of an Effective Black Hole Geometry with a Regular Core and a Finite Range Dark Sector Term 具有规则核心和有限范围暗扇区项的有效黑洞几何结构的联合光子环、ISCO和标量势垒探针

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-05 DOI: 10.1007/s10773-026-06430-1

Anirudh Pradhan, K. Ghaderi, M. Zeyauddin

{"title":"Joint Photon Ring, ISCO and Scalar Barrier Probes of an Effective Black Hole Geometry with a Regular Core and a Finite Range Dark Sector Term","authors":"Anirudh Pradhan, K. Ghaderi, M. Zeyauddin","doi":"10.1007/s10773-026-06430-1","DOIUrl":"10.1007/s10773-026-06430-1","url":null,"abstract":"<div><p>We develop a joint geometric and scalar barrier framework for an effective static black hole geometry containing a regular core scale, a finite range dark sector term with amplitude <span>(sigma _textrm{d})</span> and inverse range <span>(nu _textrm{d})</span>. The lapse function is treated as a phenomenological near horizon and exterior parameterization rather than as a solution derived from a unique microscopic action. We derive the horizon structure, reconstruct the supporting effective stress tensor, and compute the photon sphere, critical impact parameter, innermost stable circular orbit, radiative efficiency, and scalar WKB barrier response. Over the explored regular de Sitter core branch, the core scale gives the dominant strong field shift: it moves the photon sphere and ISCO inward, reduces the critical impact parameter, increases the radiative efficiency, and changes the scalar potential barrier. The finite range dark sector term gives a smaller residual contribution whose inverse range controls whether the deformation reaches the photon ring, ISCO, or scalar potential peak. An explicit pair of parameter triples with the same critical impact parameter to numerical precision is separated by the timelike and scalar channels, and a sector reduced dimensionless local sensitivity matrix has numerical rank three at a representative point. The local inverse problem remains poorly conditioned along the weakest parameter combination, so the result establishes local model identifiability rather than an observational parameter forecast. The spectral sector is interpreted as a scalar test field diagnostic, not as a precision gravitational ringdown prediction.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750537","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

Quantum Non-Hermitian Sensor for High Metrological Precision Thermometry 用于高计量精度测温的量子非厄米传感器

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-05 DOI: 10.1007/s10773-026-06422-1

Somayyeh Ghorbani, Seyed Mohammad Hosseiny, Milad Norouzi

{"title":"Quantum Non-Hermitian Sensor for High Metrological Precision Thermometry","authors":"Somayyeh Ghorbani, Seyed Mohammad Hosseiny, Milad Norouzi","doi":"10.1007/s10773-026-06422-1","DOIUrl":"10.1007/s10773-026-06422-1","url":null,"abstract":"<div><p>We investigate the performance of a quantum non-Hermitian sensor based on a two-level non-Hermitian system, modeled as a spinless fermion on two lattice sites, for quantum thermometry. The fermion is coupled to a Hermitian bath at thermal equilibrium. Using Hilbert-Schmidt speed (HSS), we evaluate the metrological precision of this sensor. Our findings highlight the intricate relationship between non-Hermitian parameters and the sensor’s performance, offering valuable insights for optimizing quantum sensor design. Furthermore, we explore the potential of this sensor in different scenarios, considering the effects of environmental noise and imperfections. The sensitivity and accuracy of the quantum non-Hermitian sensor near the exceptional point are suppressed, limiting its ability. We demonstrate the critical impact of non-Hermitian strength on the sensor’s sensitivity and accuracy, which achieves the highest sensitivity for temperature estimation in the broken symmetry phase. Notably, the proposed quantum non-Hermitian sensor attains high precision at low temperatures. Our results pave the way for developing robust and high-precision quantum sensors for a wide range of applications, pushing the boundaries of quantum metrology and sensing technologies. These sensors have potential applications in diverse fields like advanced microscopy, positioning systems, and communication technology.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750535","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

Spin-geometric Axio-dilatons, SL((2,mathbb {Z}))-dual Metrics and Pre-post Duality for Conformal Cyclic Cosmology 自旋几何轴膨胀，SL ((2,mathbb {Z})) -共形循环宇宙学的对偶度量和前后对偶性

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-05 DOI: 10.1007/s10773-026-06428-9

André Martorano Kuerten

{"title":"Spin-geometric Axio-dilatons, SL((2,mathbb {Z}))-dual Metrics and Pre-post Duality for Conformal Cyclic Cosmology","authors":"André Martorano Kuerten","doi":"10.1007/s10773-026-06428-9","DOIUrl":"10.1007/s10773-026-06428-9","url":null,"abstract":"<div><p>We implement axio-dilaton fields from spin geometry and indicate potential links between these structures and conformal spacetimes. Our approach is based on the complex generalization <span>(Omega varepsilon _{AB})</span> of the metric spinor <span>(varepsilon _{AB})</span>, which simultaneously converts Maxwell electrodynamics in vacuum into axio-dilaton electrodynamics with modular coupling <span>(tilde{tau }=textbf{i}Omega ^{-2})</span> and the spacetime metric into a conformally related metric rescaled by <span>((Omega ^{*}Omega ))</span>. By applying this complex rescaling to the Maxwell-Euler-Heisenberg theory, we demonstrate that this approach not only reproduces established axio-dilaton structures in the linear regime but also uncovers new mathematical structures within the nonlinear sector. Subsequently, by focusing on the duality group of <span>(tilde{tau })</span>, a set of SL<span>((2,mathbb {Z}))</span>-dual metrics for the conformally equivalent spacetime is obtained through the Infeld-van der Waerden map. As a formal application of these dualities, we adapt our formulation to conformal cyclic cosmology and show how the pre- and post-conformal metrics can be mapped to each other via <span>(mathcal {S})</span>-duality.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750833","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

Non-Markovian Dephasing and Flavor Coherence in a Three-Flavor Neutrino Qutrit 三味中微子粒子中的非马尔可夫脱相和味相干

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-04 DOI: 10.1007/s10773-026-06429-8

F. Aljuaydi, E. K. Jaradat, A.-B. A. Mohamed, A. S. A. Alghwali, Muhammad Noman

{"title":"Non-Markovian Dephasing and Flavor Coherence in a Three-Flavor Neutrino Qutrit","authors":"F. Aljuaydi, E. K. Jaradat, A.-B. A. Mohamed, A. S. A. Alghwali, Muhammad Noman","doi":"10.1007/s10773-026-06429-8","DOIUrl":"10.1007/s10773-026-06429-8","url":null,"abstract":"<div><p>We describe three-flavor neutrino oscillations as the dynamics of a single qutrit coupled to a classical random telegraph noise (RTN) environment. The noise acts as pure dephasing in the mass basis, and the ratio between the switching rate and the coupling strength controls whether the pairwise coherence factors evolve monotonically or exhibit memory-induced revivals. Using a representative dimensionless parameter set, we derive the time-dependent dephasing functions and rates and propagate an initial electron-flavor state to obtain survival probabilities and flavor-basis coherence quantified by the <span>(l_1)</span> norm and the relative entropy of coherence. CP-divisibility is diagnosed through pairwise coherence amplification, whereas information backflow is diagnosed independently through the trace distance of a fixed flavor-state pair. The latter provides a lower bound to the optimized BLP measure. A coherence heat map in the time–noise plane identifies the parameter region in which environmental memory significantly modifies flavor coherence. The numerical results characterize qualitative dynamical regimes rather than calibrated predictions for a specified neutrino source, baseline, energy distribution, or matter profile.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750518","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

Photon–Photon Gravitational Interaction in a Gauge Formulation of Gravity 引力规范公式中的光子-光子引力相互作用

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-03 DOI: 10.1007/s10773-026-06425-y

Abdelwahab Bensouilah

引用次数: 0

Conjugate Quarter-symmetric Recurrent Metric Connections and Ricci Solitons on Riemannian Manifolds 黎曼流形上的共轭四分之一对称循环度量连接和Ricci孤子

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-08-01 DOI: 10.1007/s10773-026-06407-0

Rajesh Kumar, Lalthanpuia Chhangte, Lalrinfeli Lianhna

引用次数: 0

DRE-QD: Dual-Randomization Encrypted Quantum Dialogue Protocol Using Single Photons in Dual Degrees of Freedom 双自由度单光子双随机加密量子对话协议

IF 2.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2026-07-31 DOI: 10.1007/s10773-026-06423-0

ChunYu Zhang, Sen Zheng, YingHua Jiang, YanBing Liu

{"title":"DRE-QD: Dual-Randomization Encrypted Quantum Dialogue Protocol Using Single Photons in Dual Degrees of Freedom","authors":"ChunYu Zhang, Sen Zheng, YingHua Jiang, YanBing Liu","doi":"10.1007/s10773-026-06423-0","DOIUrl":"10.1007/s10773-026-06423-0","url":null,"abstract":"<div><p>Many existing quantum dialogue (QD) protocols rely on multi-particle entanglement, which suffers from severe environmental decoherence. To circumvent this issue, this paper proposes a QD protocol based on single-photon polarization and spatial degrees of freedom. Furthermore, to overcome the passive information leakage vulnerabilities found in previous dual-degree-of-freedom protocols, our scheme employs a dual-randomization encryption mechanism. This approach severs the statistical correlation between ciphertexts and plaintexts to ensure security. Theoretical analysis indicates that the protocol resists common attacks, including Trojan-horse, intercept-resend, and entangle-and-measure attacks. Experimental results yield a measurement fidelity of 95.77% on the IBM <span>ibm_fez</span> superconducting quantum processor. Additionally, even under high channel loss conditions, its single-pulse detection probability remains well above the dark count baseline, demonstrating superior robustness over typical multi-particle GHZ and cluster state protocols. The results demonstrate that this protocol provides a practical and feasible solution for quantum communication networks.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148628650","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