Few-Body Systems最新文献_第2页

Isospin Symmetry of (omega ) Meson at Finite Temperature in the Soft-Wall Model of Holographic QCD 有限温度下(omega )介子在全息QCD软壁模型中的同位旋对称性

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-12-13 DOI: 10.1007/s00601-024-01977-3

Narmin Nasibova

{"title":"Isospin Symmetry of (omega ) Meson at Finite Temperature in the Soft-Wall Model of Holographic QCD","authors":"Narmin Nasibova","doi":"10.1007/s00601-024-01977-3","DOIUrl":"10.1007/s00601-024-01977-3","url":null,"abstract":"<div>The coupling constants of (rho ) meson-nucleon and (omega ) meson-nucleon are connected through the isospin relation. Using the soft-wall model of holographic QCD, the current work aims to examine the violation (if any) of isospin symmetry of the (omega )-meson as well as the temperature dependency of the (omega )-meson-(Delta ) and (omega )-meson-nucleon-(Delta ) baryon coupling constants. Applying the temperature-dependent profile functions of the vector and fermion fields to the expression of the coupling constants in the model yields the temperature dependence of the coupling constants. The minimum and magnetic type interactions between vector and fermion fields in 5-dimensional AdS space-time are included in the written interaction Lagrangian terms. The temperature dependence of the coupling constants (g_{omega N N}(T)), (g_{omega Delta Delta }(T)), and (g_{omega N Delta }(T)) has been investigated. Comparing (g_{omega NN}(T)) with the coupling constant (g_{rho NN}(T)), it is found that the isospin symmetry of the (omega ) and (rho ) mesons is not violated at the finite temperature. It is also observed that the coupling constant of the (omega ) meson with baryons decreases as the temperature increases, and this coupling constant becomes zero near the confinement-deconfinement phase transition temperature.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"66 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142811270","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

Cross Section Calculation of H–He Collisions using Three-Electron Close-Coupling Method 用三电子紧密耦合法计算H-He碰撞截面

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-12-11 DOI: 10.1007/s00601-024-01974-6

Akinori Igarashi, Daiji Kato

引用次数: 0

The Steepest Slope toward a Quantum Few-Body Solution: Gradient Variational Methods for the Quantum Few-Body Problem 量子少体解的最陡坡：量子少体问题的梯度变量方法

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-11-19 DOI: 10.1007/s00601-024-01965-7

Paolo Recchia, Debabrota Basu, Mario Gattobigio, Christian Miniatura, Stéphane Bressan

{"title":"The Steepest Slope toward a Quantum Few-Body Solution: Gradient Variational Methods for the Quantum Few-Body Problem","authors":"Paolo Recchia, Debabrota Basu, Mario Gattobigio, Christian Miniatura, Stéphane Bressan","doi":"10.1007/s00601-024-01965-7","DOIUrl":"10.1007/s00601-024-01965-7","url":null,"abstract":"<div>Quantum few-body systems are deceptively simple. Indeed, with the notable exception of a few special cases, their associated Schrödinger equation cannot be solved analytically for more than two particles. One has to resort to approximation methods to tackle quantum few-body problems. In particular, variational methods have been proposed to ease numerical calculations and obtain precise solutions. One such method is the Stochastic Variational Method, which employs a stochastic search to determine the number and parameters of correlated Gaussian basis functions used to construct an ansatz of the wave function. Stochastic methods, however, face numerical and optimization challenges as the number of particles increases.We introduce a family of gradient variational methods that replace stochastic search with gradient optimization. We comparatively and empirically evaluate the performance of the baseline Stochastic Variational Method, several instances of the gradient variational method family, and some hybrid methods for selected few-body problems. We show that gradient and hybrid methods can be more efficient and effective than the Stochastic Variational Method. We discuss the role of singularities, oscillations, and gradient optimization strategies in the performance of the respective methods.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672391","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

Rainbow Gravity Effects on Relativistic Quantum Oscillator Field in a Topological Defect Cosmological Space-Time 拓扑缺陷宇宙时空中相对论量子振荡器场的彩虹引力效应

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-11-17 DOI: 10.1007/s00601-024-01966-6

Faizuddin Ahmed, Abdelmalek Bouzenada

{"title":"Rainbow Gravity Effects on Relativistic Quantum Oscillator Field in a Topological Defect Cosmological Space-Time","authors":"Faizuddin Ahmed, Abdelmalek Bouzenada","doi":"10.1007/s00601-024-01966-6","DOIUrl":"10.1007/s00601-024-01966-6","url":null,"abstract":"<div>In this paper, we investigate the quantum dynamics of scalar and oscillator fields in a topological defect space-time background under the influence of rainbow gravity’s. The rainbow gravity’s are introduced into the considered cosmological space-time geometry by replacing the temporal part (dt rightarrow frac{dt}{mathcal {F}(chi )}) and the spatial part (dx^i rightarrow frac{dx^i}{mathcal {H} (chi )}), where (mathcal {F}, mathcal {H}) are the rainbow functions and (0 le chi =|E|/E_p <1) is the dimensionless parameter. We derived the radial equation of the Klein–Gordon equation and its oscillator equation under rainbow gravity’s in topological space-time. To obtain eigenvalue of the quantum systems under investigations, we set the rainbow functions (mathcal {F}(chi )=1) and (mathcal {H}(chi )=sqrt{1-beta ,chi ^p}), where (p=1,2). We solve the radial equations through special functions using these rainbow functions and analyze the results. In fact, it is shown that the presence of cosmological constant, the topological defect parameter (alpha ), and the rainbow parameter (beta ) modified the energy spectrum of scalar and oscillator fields in comparison to the results obtained in flat space.\u0000</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664434","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

On a Repulsive Short-Range Potential Influence on the Harmonic Oscillator 论谐波振荡器的短程斥势影响

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-11-15 DOI: 10.1007/s00601-024-01972-8

K. Bakke

引用次数: 0

Investigation of Mass and Decay Characteristics of the All-light Tetraquark 全轻四夸克的质量和衰变特性研究

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-11-12 DOI: 10.1007/s00601-024-01968-4

Chetan Lodha, Ajay Kumar Rai

引用次数: 0

Exploring Statistical Properties of Fermion-Antifermion Pairs in Magnetized Spacetime Under Non-zero Cosmology 探索非零宇宙学条件下磁化时空中费米子-反费米子对的统计特性

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-10-26 DOI: 10.1007/s00601-024-01967-5

Abdullah Guvendi, Abdelmalek Boumali

{"title":"Exploring Statistical Properties of Fermion-Antifermion Pairs in Magnetized Spacetime Under Non-zero Cosmology","authors":"Abdullah Guvendi, Abdelmalek Boumali","doi":"10.1007/s00601-024-01967-5","DOIUrl":"10.1007/s00601-024-01967-5","url":null,"abstract":"<div>This research investigates the complex statistical behavior of fermion-antifermion pairs within a (2+1)-dimensional magnetized Bonnor-Melvin background affected by non-zero cosmological conditions. The Bonnor-Melvin magnetic universe model, known for its cylindrical symmetry, preserves the invariance of quantum field dynamics under Lorentz boosts along the (z)-axis. This framework facilitates the examination of (2+1)-dimensional scenarios, where the corresponding spacetime background is identified as the Bonnor-Melvin magnetic 2+1+0-brane solution within the realm of gravity coupled with nonlinear electrodynamics. Initially, the precise energy spectra of these pairs are summarized using an analytical solution derived from the fully covariant two-body Dirac equation. Subsequently, the statistical properties inherent in these pair formations are investigated. These findings may illuminate the interplay among magnetic fields, spacetime geometry, and the cosmological constant, thereby enhancing our comprehension of the fundamental behaviors of fermions amidst intricate cosmological conditions. It is anticipated that this investigation could offer new insights into the statistical attributes of fermion-antifermion systems. All thermal characteristics, including free energy, total energy, entropy, and specific heat, have been computed. The impact of diverse factors, such as magnetic fields, spacetime geometry, and the cosmological constant, on these characteristics has been scrutinized.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518908","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

Tunnelling of a Composite Particle in Presence of a Magnetic Field 复合粒子在磁场作用下的隧道效应

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-10-19 DOI: 10.1007/s00601-024-01963-9

Bernard Faulend, Jan Dragašević

引用次数: 0

Perturbative Analysis of the Three Gluon Vertex in Different Gauges at One-Loop 一环不同量规下三胶子顶点的惯性分析

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-09-23 DOI: 10.1007/s00601-024-01956-8

J. Alejandro Alfaro, L. X. Gutiérrez-Guerrero, Luis Albino, Alfredo Raya

引用次数: 0

The 25th European Conference on Few-Body Problems in Physics (EFB25) 第 25 届欧洲物理学少体问题会议（EFB25）